diff --git a/src/wp-includes/rest-api.php b/src/wp-includes/rest-api.php
index 5548ecf5c6f45..dcd090c715dbe 100644
--- a/src/wp-includes/rest-api.php
+++ b/src/wp-includes/rest-api.php
@@ -1570,7 +1570,28 @@ function rest_is_boolean( $maybe_bool ) {
  * @return bool True if an integer, otherwise false.
  */
 function rest_is_integer( $maybe_integer ) {
-	return is_numeric( $maybe_integer ) && round( (float) $maybe_integer ) === (float) $maybe_integer;
+	if ( is_int( $maybe_integer ) ) {
+		return true;
+	}
+
+	if ( is_bool( $maybe_integer ) || ! is_scalar( $maybe_integer ) ) {
+		return false;
+	}
+
+	$integer_pattern    = '/^[+-]?\d+$/';
+	$scientific_pattern = '/^[+-]?\d+e\+?\d+$/i';
+
+	$value = trim( (string) $maybe_integer );
+
+	if ( preg_match( $integer_pattern, $value ) ) {
+		return true;
+	}
+
+	if ( preg_match( $scientific_pattern, $value ) ) {
+		return true;
+	}
+
+	return false;
 }
 
 /**