I believe, that if use utf8 is in scope, all literals are marked as utf-8, but note that that only works on string literals. If you're reading strings from anywhere else, you still need to make sure they're upgraded in some other way.

By the way, the reason DBD::mysql currently doesn't upgrade all input is that it's not immediately clear which data/columns should be utf-8 text (and should be upgraded) and which is non-utf8 text or binary data (and must be left alone).

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^3: Why does perl not mark variable as utf-8? by Joost
in thread Why does perl not mark variable as utf-8? by Anonymous Monk

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