Improve performance by switching from in_array() to isset() #90
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Hi,
I've found that performance of in_array() for 3 elements is much worse than isset() and implemented the fix for saveString() method.
I've found this place in code while profiling Magento2 static content deployment procedure.
Improvement is very small, but the function called a lot of times according to xdebug profiling output (55k times in my case)
Andrey.