Speeding filter up

[Dnyarri]

Surprisingly, there is still a room for improvement!

One of internal functions of filter module was sligthtly changed, which lead to function speed increase 80-100 times, which, in turn, lead to overal filter speed increase c.a. 20%.

Among other updates, main programs input validation is getting better all the time.

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This discussion was created from the release Speeding filter up.