The value of templateAlpha will be NaN if max is equal to min. #332
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Actually NaN does not lead to a bug, cause I find something below about globalAlpha on MDN:
"Values outside that range, including Infinity and NaN, will not be set, and globalAlpha will retain its previous value."
And, of course. The default value is 1.
However, I do not think it is a good idea to compare a number with NaN.
Hope this commit will help.