Do not let string subtypes subsume class-strings #5497
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Previously, Psalm would treat unions like `class-string|numeric-string` as `numeric-string`, while the only case when string should subsume `class-string` is when we're combining `class-string` with non-specific `string`. Fixes vimeo#5491
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Previously, Psalm would treat unions like
class-string|numeric-stringasnumeric-string, while the only case when string should subsumeclass-stringis when we're combiningclass-stringwith non-specificstring.Fixes #5491