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Field specification factory for :py:class:`PRecord`.
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Raised when trying to assign a value with a type that doesn't match the declared type.
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Create checked field for either ``PSet`` or ``PVector``.
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Create checked ``PSet`` field.
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for the field.
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Create checked ``PVector`` field.
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Create a checked ``PMap`` field.
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:param value: The required type for the values of the map.
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this field.
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:return: A ``field`` containing a ``CheckedPMap``.
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