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[Galik]

I don't like the idea of duplicating the std libraries just to make thread safe versions and, frankly, thread safety is the job of the programmer, not the library. Java did a reversal on this with an initially thread-safe collections library which was superseded by a non-thread safe (faster) version.

[rapidcoder]

... and ended up with both having very similar performance, after the recent compiler advances, at least on the server VM which eliminates unneeded thread-safety code automatically. So maybe the initial decision was not that bad.