implements base64{enc,dec} interpolation funcs

[glerchundi]

fixes #3320

Signed-off-by: Gorka Lerchundi Osa glertxundi@gmail.com

[stack72]

@glerchundi this looks very cool. I would love to see 1 of the acceptance tests updated to include an encrypted string just to see it in action :)

[apparentlymart]

Thanks for working on this! 👍

[apparentlymart]

I've merged this along with a follow-up commit c3d15a2 to add these functions to the interpolation docs. Thanks again!

[radeksimko]

@apparentlymart Maybe a nitpick, but I still think it's worth asking before this reaches release - How about renaming these functions to base64encode and base64decode?

I have not seen enc or dec as a conventional abbreviations used anywhere, in fact dec could even evoke decimal.

[stack72]

I'd love to see some examples of usage added to the examples repo

[apparentlymart]

@radeksimko a fair point... also none of the other function names include abbreviated words. I think I agree with you. Shall I make a followup commit to fix this now, or do you think it's worth seeking other input first?

[radeksimko]

@apparentlymart I think two maintainers in agreement should be enough 😉
Make a followup PR, I'll merge it.

[glerchundi]

Cool, thanks! :)

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