[m-dev.] question about mode representation

[Michael Day]

> For all that time, the compiler will need more memory to represent programs
> than it does right now, and initially, the time needed to fill in the
> new field won't generate any returns in terms of performance. (There will be
> such returns later, when switching to use the new field allows a compiler
> pass to avoid threading the current instmap though.)

Developer time is worth more than memory usage, so whatever approach 
makes software engineering smoother is probably the way to go.

Michael

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