Pretty print bytevectors with its content in hex format

[Zhu Zihao]

Hi, dear Guile users!

I'm using Guile to play around with some binaries. In Guile, the
bytevector prints its content in decimal format. Just like:

#vu8(255 255 255 255)

But, it's always more convenient if its content is printed in hex format
like

#vu8(#xff #xff #xff #xff)

I don't see any option to toggle this, What should I do to custom how
bytevector looks?

Thanks!
-- 
Retrieve my PGP public key:

  gpg --recv-keys B3EBC086AB0EBC0F45E0B4D433DB374BCEE4D9DC

Zihao

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