Question on fixed point range constraints

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I'm trying to create a fixed point type without narrowly
constraining its range. I'd like to use an attribute for
this. Can anyone suggest a way to do this?


i.e  I do not want to do this:

type Velocity is delta 0.01 range -1.0 .. 1.0;

I'd like to do something like this;

type Velocity is delta 0.01 range ?'small .. ?'large;