int-conv: Direct conversion functions between Ints and Words

This library defines a complete collection of conversion functions between machine integers: wordToWord32, word32ToWord64 etc.

All these functions behave like fromIntegral, but avoid going through Integer. (GHC has a specific optimisation to remove an intermediate Integer from fromIntegral conversions, but if we can be explicit, and wont need to rely on an optimisation, why wouldn't we?)

There are also conversion to/from Char. Convertions to Char are unsafe, as these allow to create invalid Char values (negative, or larger then maximum codepoint). In particular intToChar is not the same as chr; chr performs bounds check; intToChar doesn't. Conversion from Char are equivalent to fromIntegral . ord. Conversion to Char are equivalent to intToChar . fromIntegral, which does not perform bounds checks.

Only GHC>=9.4 is supported, as the primitive integers had been reworked in GHC-9.4.

This package deliberately doesn't provide any abstraction over the conversion functions.

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