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This PR proposes to change the implementation of the
Ttypes.is_ts_tuple
function so that it doesnt confuseunit
for a tuple of length 0.This has the immediate benefit of concentrating the logic in the function rather than having to check that a type symbol is not
ts_unit
before callingis_ts_tuple
(hence the simplifcation of the condition inTyping.process_val_spec
.This also improves the state of ortac#207