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Closes #1298
This PR:
Optional
trait type as a shorthand forUnion(None, ...)
Union
to refer to subclass names, e.g.Optional
(let me know if this is controversial and I can change!)Constant
,Union
, andOptional
demonstrating behaviour discussed inConstant
constraint not enforced inUnion
#1784, some of these may also be controversial and I can remove/alter them if soChecklist
docs/source/traits_api_reference
)docs/source/traits_user_manual
)