- lengthExceeds, lengthIs, lengthAtLeast,
- listLengthCmp, atLength, equalLength, compareLength,
+ lengthExceeds, lengthIs, lengthAtLeast,
+ listLengthCmp, atLength, equalLength, compareLength,
+
+ isSingleton, only, singleton,
+ notNull, snocView,
+
+ isIn, isn'tIn,