remove literal generic type parameters of Can*
#487
Merged
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The following protocols are no longer generic:
CanBytesCanStrCanIndexCanReprCanFormatCanDelattrCanLenCanLengthHintCanBufferAdditionally,
CanGetattr,CanSetattr, andCanSetNamehad their first genericstr-bound type parameter removed, so that now accept a single type arugment.Similarly, this removes the last type-parameter of the
CanContainsandCanSequenceprotocols.These changes were made because passing
Literals as generic type arguments almost never works as intended in practice. One excpetion isCanBool, which has some use-cases, and is therefore left as a generic type.