performance improvements#53

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cazacugmihai wants to merge 11 commits intoyomorun:masterfrom

cazacugmihai:master

Commits on Feb 21, 2018

Commits on Feb 22, 2018

Commits on Feb 23, 2018

fixed returned version
cazacugmihai
committed

Commits on Feb 24, 2018

used copyOf instead of copyOfRange
cazacugmihai
committed