Fix type specification of various string functions with constant strings in a falsey context #1488
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…ngs in a falsey context
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Closes phpstan/phpstan#7555
Apparently this would return that some constant string is surely not e.g.
'ab'in a falsey scope but at the same time the scope has the info that it surely is'ab'in a truthy scope. And that seams lead to a*NEVER*type.The blocks before this one, that deal with a related thing, do it a bit different but very similar, e.g. https://github.com/phpstan/phpstan-src/blob/1.8.0/src/Analyser/TypeSpecifier.php#L237