Add UNKNOWN_TO_SDK value to enums #1998
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This PR asserts that enums returned by the API are wellknown values. Otherwise it fallback to the
UNKNOWN_TO_SDKgeneric value.In that way, we respect the contract when saying methods returns a
FooEnum::*.Side note: We still have to keep the psalm exceptions, because psalm can not infer the type of
Enum::exists($value) ? $value : Enum:FALLBACKtoEnum::*.see https://psalm.dev/r/518a0924fe
We would need an equivalent of typescript's
iskeyword https://www.typescriptlang.org/docs/handbook/2/narrowing.html#using-type-predicatesfix #1921