Could lables be made to support tuples of (from, to) ?

[alex-s-gardner]

Could lables be made to support tuples of (from, to) ?

When using cut I would like to return numeric labels for the bind range. This seems like a common use case.

I would like to be able to pass:
labels = fmt(from, to, i; leftclosed, rightclosed) = (from, to)

[nalimilan]

Tuples are not among the supported types for CategoricalArray levels, and supporting them would create issues with invalidations (#177). But what could be done is allow requesting cut to return a plain Array, which could hold tuples.