kelindar / bitmap / 35318586043

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Fix fromHex endianness on big-endian architectures (s390x) (#48)

* Fix fromHex endianness on big-endian architectures

The fromHex function reverses decoded hex bytes into little-endian
order, then calls FromBytes() which uses an unsafe pointer cast to
reinterpret []byte as []uint64. This cast uses native byte order,
producing incorrect results on big-endian systems (e.g. s390x).

Replace the unsafe FromBytes() call with explicit
binary.LittleEndian.Uint64() decoding so the hex-to-bitmap
conversion is correct on all architectures.

Fixes #47

* test: cover fromHex byte order

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Co-authored-by: Roman <roman.atachiants@gmail.com>

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