diff --git a/src/Forms/Blueprint.php b/src/Forms/Blueprint.php
index 2f11e940..67ace295 100644
--- a/src/Forms/Blueprint.php
+++ b/src/Forms/Blueprint.php
@@ -99,7 +99,7 @@ protected function receiveHttpData(): ?array
 				public $inner;
 
 
-				public function getLabel($caption = null): Html|string|null
+				public function getLabel(string|\Stringable|null $caption = null): Html|string|null
 				{
 					return $this->inner->getLabel()
 						? '{label ' . $this->inner->lookupPath(Form::class) . '/}'
diff --git a/src/Forms/Container.php b/src/Forms/Container.php
index 9de29111..824708fa 100644
--- a/src/Forms/Container.php
+++ b/src/Forms/Container.php
@@ -11,6 +11,7 @@
 
 use Nette;
 use Nette\Utils\ArrayHash;
+use Stringable;
 
 
 /**
@@ -314,9 +315,13 @@ public function getForm(bool $throw = true): ?Form
 
 	/**
 	 * Adds single-line text input control to the form.
-	 * @param  string|object|null  $label
 	 */
-	public function addText(string $name, $label = null, ?int $cols = null, ?int $maxLength = null): Controls\TextInput
+	public function addText(
+		string $name,
+		string|Stringable|null $label = null,
+		?int $cols = null,
+		?int $maxLength = null,
+	): Controls\TextInput
 	{
 		return $this[$name] = (new Controls\TextInput($label, $maxLength))
 			->setHtmlAttribute('size', $cols);
@@ -325,11 +330,10 @@ public function addText(string $name, $label = null, ?int $cols = null, ?int $ma
 
 	/**
 	 * Adds single-line text input control used for sensitive input such as passwords.
-	 * @param  string|object|null  $label
 	 */
 	public function addPassword(
 		string $name,
-		$label = null,
+		string|Stringable|null $label = null,
 		?int $cols = null,
 		?int $maxLength = null,
 	): Controls\TextInput
@@ -342,9 +346,13 @@ public function addPassword(
 
 	/**
 	 * Adds multi-line text input control to the form.
-	 * @param  string|object|null  $label
 	 */
-	public function addTextArea(string $name, $label = null, ?int $cols = null, ?int $rows = null): Controls\TextArea
+	public function addTextArea(
+		string $name,
+		string|Stringable|null $label = null,
+		?int $cols = null,
+		?int $rows = null,
+	): Controls\TextArea
 	{
 		return $this[$name] = (new Controls\TextArea($label))
 			->setHtmlAttribute('cols', $cols)->setHtmlAttribute('rows', $rows);
@@ -353,9 +361,8 @@ public function addTextArea(string $name, $label = null, ?int $cols = null, ?int
 
 	/**
 	 * Adds input for email.
-	 * @param  string|object|null  $label
 	 */
-	public function addEmail(string $name, $label = null): Controls\TextInput
+	public function addEmail(string $name, string|Stringable|null $label = null): Controls\TextInput
 	{
 		return $this[$name] = (new Controls\TextInput($label))
 			->addRule(Form::Email);
@@ -364,9 +371,8 @@ public function addEmail(string $name, $label = null): Controls\TextInput
 
 	/**
 	 * Adds input for integer.
-	 * @param  string|object|null  $label
 	 */
-	public function addInteger(string $name, $label = null): Controls\TextInput
+	public function addInteger(string $name, string|Stringable|null $label = null): Controls\TextInput
 	{
 		return $this[$name] = (new Controls\TextInput($label))
 			->setNullable()
@@ -376,9 +382,8 @@ public function addInteger(string $name, $label = null): Controls\TextInput
 
 	/**
 	 * Adds input for float.
-	 * @param  string|object|null  $label
 	 */
-	public function addFloat(string $name, $label = null): Controls\TextInput
+	public function addFloat(string $name, string|Stringable|null $label = null): Controls\TextInput
 	{
 		return $this[$name] = (new Controls\TextInput($label))
 			->setNullable()
@@ -390,9 +395,8 @@ public function addFloat(string $name, $label = null): Controls\TextInput
 
 	/**
 	 * Adds input for date selection.
-	 * @param  string|object|null  $label
 	 */
-	public function addDate(string $name, $label = null): Controls\DateTimeControl
+	public function addDate(string $name, string|object|null $label = null): Controls\DateTimeControl
 	{
 		return $this[$name] = new Controls\DateTimeControl($label, Controls\DateTimeControl::TypeDate);
 	}
@@ -400,9 +404,12 @@ public function addDate(string $name, $label = null): Controls\DateTimeControl
 
 	/**
 	 * Adds input for time selection.
-	 * @param  string|object|null  $label
 	 */
-	public function addTime(string $name, $label = null, bool $withSeconds = false): Controls\DateTimeControl
+	public function addTime(
+		string $name,
+		string|object|null $label = null,
+		bool $withSeconds = false,
+	): Controls\DateTimeControl
 	{
 		return $this[$name] = new Controls\DateTimeControl($label, Controls\DateTimeControl::TypeTime, $withSeconds);
 	}
@@ -410,9 +417,12 @@ public function addTime(string $name, $label = null, bool $withSeconds = false):
 
 	/**
 	 * Adds input for date and time selection.
-	 * @param  string|object|null  $label
 	 */
-	public function addDateTime(string $name, $label = null, bool $withSeconds = false): Controls\DateTimeControl
+	public function addDateTime(
+		string $name,
+		string|object|null $label = null,
+		bool $withSeconds = false,
+	): Controls\DateTimeControl
 	{
 		return $this[$name] = new Controls\DateTimeControl($label, Controls\DateTimeControl::TypeDateTime, $withSeconds);
 	}
@@ -420,9 +430,8 @@ public function addDateTime(string $name, $label = null, bool $withSeconds = fal
 
 	/**
 	 * Adds control that allows the user to upload files.
-	 * @param  string|object|null  $label
 	 */
-	public function addUpload(string $name, $label = null): Controls\UploadControl
+	public function addUpload(string $name, string|Stringable|null $label = null): Controls\UploadControl
 	{
 		return $this[$name] = new Controls\UploadControl($label, multiple: false);
 	}
@@ -430,9 +439,8 @@ public function addUpload(string $name, $label = null): Controls\UploadControl
 
 	/**
 	 * Adds control that allows the user to upload multiple files.
-	 * @param  string|object|null  $label
 	 */
-	public function addMultiUpload(string $name, $label = null): Controls\UploadControl
+	public function addMultiUpload(string $name, string|Stringable|null $label = null): Controls\UploadControl
 	{
 		return $this[$name] = new Controls\UploadControl($label, multiple: true);
 	}
@@ -450,9 +458,8 @@ public function addHidden(string $name, $default = null): Controls\HiddenField
 
 	/**
 	 * Adds check box control to the form.
-	 * @param  string|object|null  $caption
 	 */
-	public function addCheckbox(string $name, $caption = null): Controls\Checkbox
+	public function addCheckbox(string $name, string|Stringable|null $caption = null): Controls\Checkbox
 	{
 		return $this[$name] = new Controls\Checkbox($caption);
 	}
@@ -460,9 +467,12 @@ public function addCheckbox(string $name, $caption = null): Controls\Checkbox
 
 	/**
 	 * Adds set of radio button controls to the form.
-	 * @param  string|object|null  $label
 	 */
-	public function addRadioList(string $name, $label = null, ?array $items = null): Controls\RadioList
+	public function addRadioList(
+		string $name,
+		string|Stringable|null $label = null,
+		?array $items = null,
+	): Controls\RadioList
 	{
 		return $this[$name] = new Controls\RadioList($label, $items);
 	}
@@ -470,9 +480,12 @@ public function addRadioList(string $name, $label = null, ?array $items = null):
 
 	/**
 	 * Adds set of checkbox controls to the form.
-	 * @param  string|object|null  $label
 	 */
-	public function addCheckboxList(string $name, $label = null, ?array $items = null): Controls\CheckboxList
+	public function addCheckboxList(
+		string $name,
+		string|Stringable|null $label = null,
+		?array $items = null,
+	): Controls\CheckboxList
 	{
 		return $this[$name] = new Controls\CheckboxList($label, $items);
 	}
@@ -480,9 +493,13 @@ public function addCheckboxList(string $name, $label = null, ?array $items = nul
 
 	/**
 	 * Adds select box control that allows single item selection.
-	 * @param  string|object|null  $label
 	 */
-	public function addSelect(string $name, $label = null, ?array $items = null, ?int $size = null): Controls\SelectBox
+	public function addSelect(
+		string $name,
+		string|Stringable|null $label = null,
+		?array $items = null,
+		?int $size = null,
+	): Controls\SelectBox
 	{
 		return $this[$name] = (new Controls\SelectBox($label, $items))
 			->setHtmlAttribute('size', $size > 1 ? $size : null);
@@ -491,11 +508,10 @@ public function addSelect(string $name, $label = null, ?array $items = null, ?in
 
 	/**
 	 * Adds select box control that allows multiple item selection.
-	 * @param  string|object|null  $label
 	 */
 	public function addMultiSelect(
 		string $name,
-		$label = null,
+		string|Stringable|null $label = null,
 		?array $items = null,
 		?int $size = null,
 	): Controls\MultiSelectBox
@@ -507,9 +523,8 @@ public function addMultiSelect(
 
 	/**
 	 * Adds color picker.
-	 * @param  string|object|null  $label
 	 */
-	public function addColor(string $name, $label = null): Controls\ColorPicker
+	public function addColor(string $name, string|Stringable|null $label = null): Controls\ColorPicker
 	{
 		return $this[$name] = new Controls\ColorPicker($label);
 	}
@@ -517,9 +532,8 @@ public function addColor(string $name, $label = null): Controls\ColorPicker
 
 	/**
 	 * Adds button used to submit form.
-	 * @param  string|object|null  $caption
 	 */
-	public function addSubmit(string $name, $caption = null): Controls\SubmitButton
+	public function addSubmit(string $name, string|Stringable|null $caption = null): Controls\SubmitButton
 	{
 		return $this[$name] = new Controls\SubmitButton($caption);
 	}
@@ -527,9 +541,8 @@ public function addSubmit(string $name, $caption = null): Controls\SubmitButton
 
 	/**
 	 * Adds push buttons with no default behavior.
-	 * @param  string|object|null  $caption
 	 */
-	public function addButton(string $name, $caption = null): Controls\Button
+	public function addButton(string $name, string|Stringable|null $caption = null): Controls\Button
 	{
 		return $this[$name] = new Controls\Button($caption);
 	}
diff --git a/src/Forms/Controls/BaseControl.php b/src/Forms/Controls/BaseControl.php
index 7e8f0feb..2cd0117a 100644
--- a/src/Forms/Controls/BaseControl.php
+++ b/src/Forms/Controls/BaseControl.php
@@ -14,6 +14,7 @@
 use Nette\Forms\Form;
 use Nette\Forms\Rules;
 use Nette\Utils\Html;
+use Stringable;
 
 
 /**
@@ -23,7 +24,7 @@
  * @property-read string $htmlName
  * @property   string|bool|null $htmlId
  * @property   mixed $value
- * @property   string|object $caption
+ * @property   string|Stringable $caption
  * @property   bool $disabled
  * @property   bool $omitted
  * @property-read Html $control
@@ -49,7 +50,7 @@ abstract class BaseControl extends Nette\ComponentModel\Component implements Con
 
 	/** @var callable[][]  extension methods */
 	private static array $extMethods = [];
-	private string|object|null $caption;
+	private string|Stringable|null $caption;
 	private array $errors = [];
 	private ?bool $omitted = null;
 	private Rules $rules;
@@ -59,10 +60,7 @@ abstract class BaseControl extends Nette\ComponentModel\Component implements Con
 	private array $options = [];
 
 
-	/**
-	 * @param  string|object  $caption
-	 */
-	public function __construct($caption = null)
+	public function __construct(string|Stringable|null $caption = null)
 	{
 		$this->control = Html::el('input', ['type' => null, 'name' => null]);
 		$this->label = Html::el('label');
@@ -79,17 +77,15 @@ public function __construct($caption = null)
 
 	/**
 	 * Sets textual caption or label.
-	 * @param object|string  $caption
 	 */
-	public function setCaption($caption): static
+	public function setCaption(string|Stringable $caption): static
 	{
 		$this->caption = $caption;
 		return $this;
 	}
 
 
-	/** @return object|string */
-	public function getCaption()
+	public function getCaption(): string|Stringable|null
 	{
 		return $this->caption;
 	}
@@ -249,10 +245,9 @@ public function getControl()
 
 	/**
 	 * Generates label's HTML element.
-	 * @param  string|object  $caption
 	 * @return Html|string|null
 	 */
-	public function getLabel($caption = null)
+	public function getLabel(string|Stringable|null $caption = null)
 	{
 		$label = clone $this->label;
 		$label->for = $this->getHtmlId();
@@ -400,11 +395,13 @@ public function translate($value, ...$parameters): mixed
 
 	/**
 	 * Adds a validation rule.
-	 * @param  string|object  $errorMessage
 	 * @return static
 	 */
-	public function addRule(callable|string $validator, $errorMessage = null, mixed $arg = null)
-	{
+	public function addRule(
+		callable|string $validator,
+		string|Stringable|null $errorMessage = null,
+		mixed $arg = null,
+	) {
 		$this->rules->addRule($validator, $errorMessage, $arg);
 		return $this;
 	}
@@ -446,9 +443,8 @@ public function getRules(): Rules
 
 	/**
 	 * Makes control mandatory.
-	 * @param  bool|string|object  $value
 	 */
-	public function setRequired($value = true): static
+	public function setRequired(string|Stringable|bool $value = true): static
 	{
 		$this->rules->setRequired($value);
 		return $this;
@@ -480,9 +476,8 @@ public function validate(): void
 
 	/**
 	 * Adds error message to the list.
-	 * @param  string|object  $message
 	 */
-	public function addError($message, bool $translate = true): void
+	public function addError(string|Stringable $message, bool $translate = true): void
 	{
 		$this->errors[] = $translate ? $this->translate($message) : $message;
 	}
diff --git a/src/Forms/Controls/Button.php b/src/Forms/Controls/Button.php
index 4e532b12..021bbcc7 100644
--- a/src/Forms/Controls/Button.php
+++ b/src/Forms/Controls/Button.php
@@ -10,6 +10,7 @@
 namespace Nette\Forms\Controls;
 
 use Nette\Utils\Html;
+use Stringable;
 
 
 /**
@@ -17,10 +18,7 @@
  */
 class Button extends BaseControl
 {
-	/**
-	 * @param  string|object  $caption
-	 */
-	public function __construct($caption = null)
+	public function __construct(string|Stringable|null $caption = null)
 	{
 		parent::__construct($caption);
 		$this->control->type = 'button';
@@ -56,9 +54,8 @@ public function renderAsButton(bool $state = true): static
 
 	/**
 	 * Generates control's HTML element.
-	 * @param  string|object  $caption
 	 */
-	public function getControl($caption = null): Html
+	public function getControl(string|Stringable|null $caption = null): Html
 	{
 		$this->setOption('rendered', true);
 		$caption = $this->translate($caption ?? $this->getCaption());
diff --git a/src/Forms/Controls/Checkbox.php b/src/Forms/Controls/Checkbox.php
index 8184d846..ff668659 100644
--- a/src/Forms/Controls/Checkbox.php
+++ b/src/Forms/Controls/Checkbox.php
@@ -11,6 +11,7 @@
 
 use Nette;
 use Nette\Utils\Html;
+use Stringable;
 
 
 /**
@@ -21,10 +22,7 @@ class Checkbox extends BaseControl
 	private Html $container;
 
 
-	/**
-	 * @param  string|object  $label
-	 */
-	public function __construct($label = null)
+	public function __construct(string|Stringable|null $label = null)
 	{
 		parent::__construct($label);
 		$this->control->type = 'checkbox';
diff --git a/src/Forms/Controls/CheckboxList.php b/src/Forms/Controls/CheckboxList.php
index 71137a0d..a04207a2 100644
--- a/src/Forms/Controls/CheckboxList.php
+++ b/src/Forms/Controls/CheckboxList.php
@@ -11,6 +11,7 @@
 
 use Nette;
 use Nette\Utils\Html;
+use Stringable;
 
 
 /**
@@ -27,10 +28,7 @@ class CheckboxList extends MultiChoiceControl
 	protected Html $itemLabel;
 
 
-	/**
-	 * @param  string|object  $label
-	 */
-	public function __construct($label = null, ?array $items = null)
+	public function __construct(string|Stringable|null $label = null, ?array $items = null)
 	{
 		parent::__construct($label, $items);
 		$this->control->type = 'checkbox';
diff --git a/src/Forms/Controls/CsrfProtection.php b/src/Forms/Controls/CsrfProtection.php
index f3f17781..4acc8428 100644
--- a/src/Forms/Controls/CsrfProtection.php
+++ b/src/Forms/Controls/CsrfProtection.php
@@ -11,6 +11,7 @@
 
 use Nette;
 use Nette\Application\UI\Presenter;
+use Stringable;
 
 
 /**
@@ -24,10 +25,7 @@ class CsrfProtection extends HiddenField
 	public ?Nette\Http\Session $session = null;
 
 
-	/**
-	 * @param string|object  $errorMessage
-	 */
-	public function __construct($errorMessage)
+	public function __construct(string|Stringable|null $errorMessage = null)
 	{
 		parent::__construct();
 		$this->setOmitted()
diff --git a/src/Forms/Controls/DateTimeControl.php b/src/Forms/Controls/DateTimeControl.php
index 55085a97..f6f053c1 100644
--- a/src/Forms/Controls/DateTimeControl.php
+++ b/src/Forms/Controls/DateTimeControl.php
@@ -11,6 +11,7 @@
 
 use Nette;
 use Nette\Forms\Form;
+use Stringable;
 
 
 /**
@@ -32,7 +33,7 @@ class DateTimeControl extends BaseControl
 	private string $format = self::FormatObject;
 
 
-	public function __construct($label = null, int $type = self::TypeDate, bool $withSeconds = false)
+	public function __construct(string|Stringable|null $label = null, int $type = self::Date, bool $withSeconds = false)
 	{
 		$this->type = $type;
 		$this->withSeconds = $withSeconds;
diff --git a/src/Forms/Controls/HiddenField.php b/src/Forms/Controls/HiddenField.php
index c8049957..7f133f60 100644
--- a/src/Forms/Controls/HiddenField.php
+++ b/src/Forms/Controls/HiddenField.php
@@ -11,6 +11,7 @@
 
 use Nette;
 use Nette\Utils\Html;
+use Stringable;
 
 
 /**
@@ -98,9 +99,8 @@ public function getLabel($caption = null): Html|string|null
 
 	/**
 	 * Adds error message to the list.
-	 * @param  string|object  $message
 	 */
-	public function addError($message, bool $translate = true): void
+	public function addError(string|Stringable $message, bool $translate = true): void
 	{
 		$this->getForm()->addError($message, $translate);
 	}
diff --git a/src/Forms/Controls/RadioList.php b/src/Forms/Controls/RadioList.php
index 227f5cd9..4a243e5f 100644
--- a/src/Forms/Controls/RadioList.php
+++ b/src/Forms/Controls/RadioList.php
@@ -11,6 +11,7 @@
 
 use Nette;
 use Nette\Utils\Html;
+use Stringable;
 
 
 /**
@@ -28,10 +29,7 @@ class RadioList extends ChoiceControl
 	protected Html $itemLabel;
 
 
-	/**
-	 * @param  string|object  $label
-	 */
-	public function __construct($label = null, ?array $items = null)
+	public function __construct(string|Stringable|null $label = null, ?array $items = null)
 	{
 		parent::__construct($label, $items);
 		$this->control->type = 'radio';
diff --git a/src/Forms/Controls/SelectBox.php b/src/Forms/Controls/SelectBox.php
index e6be2f7f..8ab3f06d 100644
--- a/src/Forms/Controls/SelectBox.php
+++ b/src/Forms/Controls/SelectBox.php
@@ -10,6 +10,7 @@
 namespace Nette\Forms\Controls;
 
 use Nette;
+use Stringable;
 
 
 /**
@@ -23,7 +24,7 @@ class SelectBox extends ChoiceControl
 
 	/** of option / optgroup */
 	private array $options = [];
-	private string|object|false $prompt = false;
+	private string|Stringable|false $prompt = false;
 	private array $optionAttributes = [];
 
 
@@ -41,9 +42,8 @@ public function __construct($label = null, ?array $items = null)
 
 	/**
 	 * Sets first prompt item in select box.
-	 * @param  string|object|false  $prompt
 	 */
-	public function setPrompt($prompt): static
+	public function setPrompt(string|Stringable|false $prompt): static
 	{
 		$this->prompt = $prompt;
 		return $this;
@@ -52,9 +52,8 @@ public function setPrompt($prompt): static
 
 	/**
 	 * Returns first prompt item?
-	 * @return string|object|false
 	 */
-	public function getPrompt()
+	public function getPrompt(): string|Stringable|false
 	{
 		return $this->prompt;
 	}
diff --git a/src/Forms/Controls/SubmitButton.php b/src/Forms/Controls/SubmitButton.php
index 1a423e1b..69d7eb98 100644
--- a/src/Forms/Controls/SubmitButton.php
+++ b/src/Forms/Controls/SubmitButton.php
@@ -10,6 +10,7 @@
 namespace Nette\Forms\Controls;
 
 use Nette;
+use Stringable;
 
 
 /**
@@ -30,10 +31,7 @@ class SubmitButton extends Button implements Nette\Forms\SubmitterControl
 	private ?array $validationScope = null;
 
 
-	/**
-	 * @param  string|object  $caption
-	 */
-	public function __construct($caption = null)
+	public function __construct(string|Stringable|null $caption = null)
 	{
 		parent::__construct($caption);
 		$this->control->type = 'submit';
diff --git a/src/Forms/Controls/TextArea.php b/src/Forms/Controls/TextArea.php
index 160607a6..80dddb7f 100644
--- a/src/Forms/Controls/TextArea.php
+++ b/src/Forms/Controls/TextArea.php
@@ -10,6 +10,7 @@
 namespace Nette\Forms\Controls;
 
 use Nette;
+use Stringable;
 
 
 /**
@@ -17,10 +18,7 @@
  */
 class TextArea extends TextBase
 {
-	/**
-	 * @param  string|object  $label
-	 */
-	public function __construct($label = null)
+	public function __construct(string|Stringable|null $label = null)
 	{
 		parent::__construct($label);
 		$this->control->setName('textarea');
diff --git a/src/Forms/Controls/TextBase.php b/src/Forms/Controls/TextBase.php
index efa2449d..d8cbd15c 100644
--- a/src/Forms/Controls/TextBase.php
+++ b/src/Forms/Controls/TextBase.php
@@ -12,6 +12,7 @@
 use Nette;
 use Nette\Forms\Form;
 use Nette\Utils\Strings;
+use Stringable;
 
 
 /**
@@ -119,8 +120,11 @@ protected function getRenderedValue(): ?string
 
 
 	/** @return static */
-	public function addRule(callable|string $validator, $errorMessage = null, mixed $arg = null)
-	{
+	public function addRule(
+		callable|string $validator,
+		string|Stringable|null $errorMessage = null,
+		mixed $arg = null,
+	) {
 		foreach ($this->getRules() as $rule) {
 			if (!$rule->canExport() && !$rule->branch) {
 				return parent::addRule($validator, $errorMessage, $arg);
diff --git a/src/Forms/Controls/TextInput.php b/src/Forms/Controls/TextInput.php
index 4bbeb092..95f5f666 100644
--- a/src/Forms/Controls/TextInput.php
+++ b/src/Forms/Controls/TextInput.php
@@ -11,6 +11,7 @@
 
 use Nette;
 use Nette\Forms\Form;
+use Stringable;
 
 
 /**
@@ -18,10 +19,7 @@
  */
 class TextInput extends TextBase
 {
-	/**
-	 * @param  string|object  $label
-	 */
-	public function __construct($label = null, ?int $maxLength = null)
+	public function __construct(string|Stringable|null $label = null, ?int $maxLength = null)
 	{
 		parent::__construct($label);
 		$this->control->maxlength = $maxLength;
@@ -64,8 +62,11 @@ public function getControl(): Nette\Utils\Html
 
 
 	/** @return static */
-	public function addRule(callable|string $validator, $errorMessage = null, mixed $arg = null)
-	{
+	public function addRule(
+		callable|string $validator,
+		string|Stringable|null $errorMessage = null,
+		mixed $arg = null,
+	) {
 		foreach ($this->getRules() as $rule) {
 			if (!$rule->canExport() && !$rule->branch) {
 				return parent::addRule($validator, $errorMessage, $arg);
diff --git a/src/Forms/Controls/UploadControl.php b/src/Forms/Controls/UploadControl.php
index cafb35b4..a862d9d3 100644
--- a/src/Forms/Controls/UploadControl.php
+++ b/src/Forms/Controls/UploadControl.php
@@ -14,6 +14,7 @@
 use Nette\Forms\Form;
 use Nette\Http\FileUpload;
 use Nette\Utils\Arrays;
+use Stringable;
 
 
 /**
@@ -26,10 +27,7 @@ class UploadControl extends BaseControl
 	public const VALID = self::Valid;
 
 
-	/**
-	 * @param  string|object  $label
-	 */
-	public function __construct($label = null, bool $multiple = false)
+	public function __construct(string|Stringable|null $label = null, bool $multiple = false)
 	{
 		parent::__construct($label);
 		$this->control->type = 'file';
@@ -98,8 +96,11 @@ public function isOk(): bool
 
 
 	/** @return static */
-	public function addRule(callable|string $validator, $errorMessage = null, mixed $arg = null)
-	{
+	public function addRule(
+		callable|string $validator,
+		string|Stringable|null $errorMessage = null,
+		mixed $arg = null,
+	) {
 		if ($validator === Form::Image) {
 			$this->control->accept = implode(', ', Forms\Helpers::getSupportedImages());
 
diff --git a/src/Forms/Form.php b/src/Forms/Form.php
index 66ee8a04..dbe13251 100644
--- a/src/Forms/Form.php
+++ b/src/Forms/Form.php
@@ -12,6 +12,7 @@
 use Nette;
 use Nette\Utils\Arrays;
 use Nette\Utils\Html;
+use Stringable;
 
 
 /**
@@ -177,9 +178,8 @@ public function getForm(bool $throw = true): static
 
 	/**
 	 * Sets form's action.
-	 * @param  string|object  $url
 	 */
-	public function setAction($url): static
+	public function setAction(string|Stringable $url): static
 	{
 		$this->getElementPrototype()->action = $url;
 		return $this;
@@ -262,7 +262,7 @@ public function addProtection(?string $errorMessage = null): Controls\CsrfProtec
 	/**
 	 * Adds fieldset group to the form.
 	 */
-	public function addGroup(string|object|null $caption = null, bool $setAsCurrent = true): ControlGroup
+	public function addGroup(string|Stringable|null $caption = null, bool $setAsCurrent = true): ControlGroup
 	{
 		$group = new ControlGroup;
 		$group->setOption('label', $caption);
@@ -550,9 +550,8 @@ public function validateMaxPostSize(): void
 
 	/**
 	 * Adds global error message.
-	 * @param  string|object  $message
 	 */
-	public function addError($message, bool $translate = true): void
+	public function addError(string|Stringable $message, bool $translate = true): void
 	{
 		if ($translate && $this->translator) {
 			$message = $this->translator->translate($message);
diff --git a/src/Forms/Rule.php b/src/Forms/Rule.php
index bae34bea..27d57815 100644
--- a/src/Forms/Rule.php
+++ b/src/Forms/Rule.php
@@ -10,6 +10,7 @@
 namespace Nette\Forms;
 
 use Nette;
+use Stringable;
 
 
 /**
@@ -21,7 +22,7 @@ class Rule
 	public mixed $validator;
 	public mixed $arg = null;
 	public bool $isNegative = false;
-	public object|string|null $message;
+	public string|Stringable|null $message;
 	public ?Rules $branch = null;
 
 
diff --git a/src/Forms/Rules.php b/src/Forms/Rules.php
index a1a84749..1db83c43 100644
--- a/src/Forms/Rules.php
+++ b/src/Forms/Rules.php
@@ -10,6 +10,7 @@
 namespace Nette\Forms;
 
 use Nette;
+use Stringable;
 
 
 /**
@@ -40,9 +41,8 @@ public function __construct(Control $control)
 
 	/**
 	 * Makes control mandatory.
-	 * @param  string|bool  $value
 	 */
-	public function setRequired($value = true): static
+	public function setRequired(string|Stringable|bool $value = true): static
 	{
 		if ($value) {
 			$this->addRule(Form::Filled, $value === true ? null : $value);
@@ -65,9 +65,12 @@ public function isRequired(): bool
 
 	/**
 	 * Adds a validation rule for the current control.
-	 * @param  string|object  $errorMessage
 	 */
-	public function addRule(callable|string $validator, $errorMessage = null, mixed $arg = null): static
+	public function addRule(
+		callable|string $validator,
+		string|Stringable|null $errorMessage = null,
+		mixed $arg = null,
+	): static
 	{
 		if ($validator === Form::Valid || $validator === ~Form::Valid) {
 			throw new Nette\InvalidArgumentException('You cannot use Form::Valid in the addRule method.');