Mutable Data in Parametric Types

[LenkyDev]

Parametric types do not support mutable data definitions.

This has been an issue since parametric types were introduced and it makes them generally useless.

This results in needing to hand-write classes to handle different data types.

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Moose (purin.ca)

[janvitek]

This has been implemented, it need to percolate to a release.