Add in default_factory argument to Optional parser #18
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Supports cases where the user wants to return some mutable object, but a new
instance each time. For instance, Optional(something, default={}) will return
the exact same dict each time, which may not be the desired behaviour.
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Supports cases where the user wants to return some mutable object, but a new instance each time. For instance, Optional(something, default={}) will return the exact same dict each time, which may not be the desired behaviour.