Implement Utf8Helper.getAllowedCharsets() to lazy-load allowedCharsets, make Utf8Helper.allowedCharsets private
#176
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…sets`, make `Utf8Helper.allowedCharsets` private
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I've noticed that since 16.3.0, a simple instantiation of
SWF()takes way longer than it previously did (around 2 vs .3 seconds on my computer). So I've pinpointed the issue to 4c6ccf0, which added anallowedCharsetsstatic variable inUtf8Helperwhich was populated in astatic {...}block even if it was never going to be used.This PR implements lazy-loading of
Utf8Helper.allowedCharsetsviaUtf8Helper.getAllowedCharsets(), so that it does not waste time generating when not needed.