AsPrimitiveA generic interface for casting between machine scalars with the
as operator, which admits narrowing and precision loss.
Implementers of this trait AsPrimitive should behave like a primitive
numeric type (e.g. a newtype around another primitive), and the
intended conversion must never fail.
FromPrimitiveA generic trait for converting a number to a value.
NumCastAn interface for casting between machine scalars.
ToPrimitiveA generic trait for converting a value to a number.