Cleanup

generator/solo/groups.py

@@ -6,6 +6,7 @@ not a rhythmic boundary and must not be used to clip a group.
 """
 from __future__ import annotations
 import dataclasses
+import functools
 from fractions import Fraction as F
 
 
@@ -48,6 +49,7 @@ def describe(pattern, *, origin=F(), source='', imported=False):
   return tuple(result)
 
 
+@functools.lru_cache(maxsize=8192)
 def valid(pattern):
   try:describe(pattern);return True
   except ValueError:return False