Weird !falsy assertion paradox when using template conditionals

[danog]

https://psalm.dev/r/46b3483706, but the non-templated version works fine: https://psalm.dev/r/46b3483706
Changing the $onlyType assertion to a non-null assertion also fixes it: https://psalm.dev/r/55b41e85e3

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/46b3483706

<?php
	/**
     * @param array<array{type: string}> $v
	 * @param "prof"|"organization"|null $onlyType
     * @return array<array{type: string}> 
	 */
	function getOwnerObjects(array $v, ?string $onlyType = null): array {
        $ok = [];
		foreach ($v as $owner) {
			if ($onlyType && $onlyType !== $owner['type']) {
				continue;
			}
            $ok []= $owner;
		}
        return $ok;
	}

Psalm output (using commit 42462b8):

No issues!

https://psalm.dev/r/55b41e85e3

<?php
	/**
     * @param array<array{type: string}> $v
	 * @param "prof"|"organization"|null $onlyType
     * @return ($onlyType is null ? array<array{type: string}> : array<array{type: $onlyType}>)
	 */
	function getOwnerObjects(array $v, ?string $onlyType = null): array {
        $ok = [];
		foreach ($v as $owner) {
			if ($onlyType !== null && $onlyType !== $owner['type']) {
				continue;
			}
            $ok []= $owner;
		}
        return $ok;
	}

Psalm output (using commit 42462b8):

No issues!

[AndrolGenhald]

https://psalm.dev/r/46b3483706, but the non-templated version works fine: https://psalm.dev/r/46b3483706

Those are the same link.

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/46b3483706

<?php
	/**
     * @param array<array{type: string}> $v
	 * @param "prof"|"organization"|null $onlyType
     * @return array<array{type: string}> 
	 */
	function getOwnerObjects(array $v, ?string $onlyType = null): array {
        $ok = [];
		foreach ($v as $owner) {
			if ($onlyType && $onlyType !== $owner['type']) {
				continue;
			}
            $ok []= $owner;
		}
        return $ok;
	}

Psalm output (using commit 42462b8):

No issues!

[danog]

Whoops, I meant https://psalm.dev/r/82163ab6b7 :)

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/82163ab6b7

<?php
	/**
     * @param array<array{type: string}> $v
	 * @param "prof"|"organization"|null $onlyType
     * @return array<array{type: string}> 
	 */
	function getOwnerObjects(array $v, ?string $onlyType = null): array {
        $ok = [];
		foreach ($v as $owner) {
			if ($onlyType !== null && $onlyType !== $owner['type']) {
				continue;
			}
            $ok []= $owner;
		}
        return $ok;
	}

Psalm output (using commit 42462b8):

No issues!

[AndrolGenhald]

That one also has no issues 😛

[danog]

That's the point, weird how a !falsy is buggy but a !null assertion isn't

[AndrolGenhald]

I'm still a bit confused, none of the links you posted have issues. What's different?

[danog]

Huh, my bad, I'm apparently blind, must've been an issue on my outdated fork which I didn't notice had disappeared in the psalm.dev REPL :)

[AndrolGenhald]

Is this a false-positive maybe?

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/c23cbf01bc

<?php
	/**
     * @param array<array{type: string}> $v
	 * @param "prof"|"organization"|null $onlyType
     * @return ($onlyType is null ? array<array{type: string}> : array<array{type: $onlyType}>)
	 */
	function getOwnerObjects(array $v, ?string $onlyType = null): array {
        $ok = [];
		foreach ($v as $owner) {
			if ($onlyType && $onlyType !== $owner['type']) {
				continue;
			}
            $ok []= $owner;
		}
        return $ok;
	}

Psalm output (using commit 42462b8):

ERROR: RedundantCondition - 10:8 - Type TGeneratedFromParam1:fn-getownerobjects as 'organization'|'prof' for $onlyType is never falsy

[danog]

Whoops, yes it is :)