Re^9: Seeking Perl docs about how UTF8 flag propagates

So you mean the OP didn't intend to ask if the flag is switched but if there are cases of automatic (undocumented) decoding or encoding?

I would consider any such encoding a bug. I can't see a rational for degrading from text to binary, unless you use a bit oriented operator.

Decoding from binary to text can happen, like if a transformation like lc or uc can't map otherwise.°

But that's documented and can be configured too, AFAIR.

And to be honest, treating a binary string as ASCII/Latin-1 is guesswork from Perl, it could be anything.

Strictly speaking lc and uc shouldn't be allowed then, the programmer should have properly decoded it first.

Cheers Rolf
_{(addicted to the 𐍀𐌴𐍂𐌻 Programming Language :)

Wikisyntax for the Monastery}

°) or generally if only utf8-text characters are added.

Comment on Re^9: Seeking Perl docs about how UTF8 flag propagates

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Re^10: Seeking Perl docs about how UTF8 flag propagates by haj (Vicar) on May 17, 2023 at 11:27 UTC
I didn't mean anything related to the OP's question. Following the discussion between hv and you I was concerned whether there might be a need to look at or manipulate the UTF8 flag in some circumstances. Luckily, I still don't see a reason to do this in my code.	[reply]
Re^11: Seeking Perl docs about how UTF8 flag propagates by demerphq (Chancellor) on May 17, 2023 at 13:59 UTC
There are a few legitimate reasons to explicitly change the utf8 flag (external service returning utf8 as binary is an example), but they are very rare. --- $world=~s/war/peace/g	[reply]