Added MemoizeMap to force upper limit in when memoizing objects in String#format and Date#format (Issue #540)
Added MemoizeMap to force upper limit in when memoizing objects in
String#format and Date#format (Issue #540)


Former-commit-id: e604b2919fdd1a36ae3f79365b21a02a507e82c7 [formerly f05521c851eba7231febf59dc478bcd3545e1532]
Former-commit-id: 95e15bfb21f8c70458d939726a8196d4bd0d9998
andrewplummer/Sugar,romancow/Sugar,romancow/Sugar,andrewplummer/Sugar