I find this construction
https://github.com/fricas/fricas/blob/master/src/algebra/aggcat.spad#L97
HomogeneousAggregate(S : Type) : Category == Aggregate with
...
if % has shallowlyMutable then
map! : (S->S, %) -> %
if % has finiteAggregate then
if S has BasicType then BasicType
any? : (S->Boolean, %) -> Boolean
...
rather interesting.
These has-forms certainly can only evaluate to true in a context where
Dom: Join(HomogeneousAggregate(X), finiteAggregate, ...) ===
I had probably introduced
FiniteHomogeneousAggregate(X...): Category ==
Join(HomogeneousAggregate(X), finiteAggregate, ...) with
and put the signatures that appear above in an if condition into this
more specialized category FiniteHomogeneousAggregate without condition.
Ralf
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