MASK function strange behaviour

[askethi]

When applied to polymetric pair of voices MASK returns trees with time signatures represented as simple fractions like 3/4
(so "Cannot take CAR of 3/4" follows)
Also when input trees are, say, (? (((4 4) (1 -1 1 1)))) and (? (((4 4) (1 1 -1 1)))) it returns (? (((4 4) (1 -2 1))))

[karimhaddad]

Thank you,

You are right. Apparently it is an old bug. Will try a fix ASAP.

Best
K