Support interface-string<Foo> as temporary alias of class-string<Foo> #6106
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Ref #6075
This allows library authors to hint functions as accepting
interface-string
so things won't break whenclass-string
stops accepting interface strings.Future work
Transition to using
interface-string
to exclusively mean string class constants (example branch here: https://github.com/vimeo/psalm/commits/interface-string-support)