optmized word.length/2 #1
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* divides tend to cost double CPU (perhaps JIT optimizes `/2` into `*.5` automatically, but this is a habit I picked up from hand-coding assembly ;) ) * variable lookups tend to be faster than maths
since in `var tail = 22 - (word.length + 7)`, word.length = length, we can use that again also.
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/2into*.5automatically, but this is a habit I picked up from hand-coding assembly ;) )