A flag should be a primitive with a value method that returns the bits that represent the flag. This allows a flag to encode a single bit, or any combination of bits.
interface val Flag[A: ((U8 val | U16 val | U32 val | 
    U64 val | U128 val | ULong val | 
    USize val) & Integer[A] val)]
 fun box value() : A
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Licensed under the BSD 2-Clause License.
    https://stdlib.ponylang.io/collections-Flag