Immutable types

[et1975]

Is your feature request related to a problem? Please describe.
Would be nice if the types generated were immutable (even if they remain CLIMutable). I understand that minimizing copying might have been the goal, but there gotta be a relatively inexpensive way to implement x.ReadFrom that doesn't involve mutation (at least I think that's where the mutability comes in).

Describe the solution you'd like
I'll take any.

Describe alternatives you've considered
Live with the mutable types.

Additional context
n/a.

[7sharp9]

Hmm, record update syntax is a possibility...