30 Nov
1999
30 Nov
'99
6:27 p.m.
Here is a somewhat simpler version of valuesInclude: which is based on the actual construction of the interval.
valuesInclude: aNumber "Private - answer whether or not aNumber is one of the enumerated values in this interval." | val | val _ aNumber - self first / self increment. ^ ( val - val rounded ) abs < 1e-10