even though the two methods return types are documented as returning
their respective types, in PHP they are in-fact returning `static`
internally in all versions of PHP currently supported by psalm.
This fixes#9042
Fixes#8983
This patch adds a basic test showing that, when reaching a union type with 30 elements
or more, Psalm used to fail with an error, because the large union type got simplified
into a more general type as part of performance optimizations done in `TypeCombiner::combine()`.
This means that a type like `array<1|2|3|(etcetera...)|100, mixed>` was internally
simplified to `array<int, mixed>`, after reaching 30 elements or more, which in turn
led to problems and confusing errors when large union types are in play.
Such union types are relatively common in lookup-table-alike value objects.
By removing the hardcoded call-time limit of `30` types to be combined, we hereby
rely on the default `TypeCombiner::combine()` limit of `500` items, which is more
healthy.
This may come with some performance implications, but it is worth trying out, for
now.
Further parameters passed to `TypeCombiner::combine()` that were already matching
parameter default values were also omitted from the call-sites.