API(fields): turn spin weight into a class property #93
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Turn the spin weight of
Fieldsubclasses from an__init__()keyword into a metaclass keyword. This removes the need for a trivial__init__()override in subclasses.By default, the spin weight is undefined. If an undefined spin weight is obtained via the default
.spinproperty, aValueErroris raised.If necessary,
Fieldsubclasses can override the default.spinproperty to implement dynamic, instance-based spin weights.Closes: #92
Closes: #51