in reply to Float/double to hex?
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I try it :)
[to hex], [convert to hex] to hex, convert to hex -> How to zero-pad hex values in sprintf()?, integer value to hex value, Convert to Hexadecimal, Converting Hexadecimal to Decimal notation and vice-versa
so sprintf '%x' ... or unpack 'H*', ... or Math::BigInt->as_hex
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