in reply to Re^2: Use pack to create a float in non-native format
in thread Use pack to create a float in non-native format

I didn't think to try the built-in big-endian conversion, because you said you'd already tried reversing the bytes. And that's all it does.

I missed that you'd forgotten the scalar context requirement: 

print unpack 'H*', pack 'f>', 123.456;;
42f6e979

print unpack 'H*', scalar reverse pack 'f', 123.456;;
42f6e979

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