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make JS trunc polyfill opt-in, closes #16144 (#19183)

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hlaaftana 2021-11-24 10:20:15 +03:00 • committed by GitHub
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@ -3,7 +3,13 @@
## Changes affecting backward compatibility
- The `Math.trunc` polyfill for targeting Internet Explorer was
previously emitted for every JavaScript output file except if
the symbol `nodejs` was defined via `-d:nodejs`. Now, it is only
emitted if the symbol `nimJsMathTruncPolyfill` is defined. If you are
targeting Internet Explorer, you may choose to enable this option
or define your own `Math.trunc` polyfill using the [`emit` pragma](https://nim-lang.org/docs/manual.html#implementation-specific-pragmas-emit-pragma). Nim uses
`Math.trunc` for the division and modulo operators for integers.
## Standard library additions and changes