On Tue, Feb 2, 2021 at 3:47 AM Inada Naoki <songofacandy@gmail.com> wrote:

But when wchar_t* is UTF-16, ucs2_utf8_encoder() can not handle
surrogate escape.
We need to use a temporary Unicode object. That is what "inefficient" means.

Since real UCS-2 is effectively dead, maybe it should be flipped around: Make UTF-16 be the efficient path and UCS-2 be the path that needs to round-trip through Unicode. But I suppose that's out of scope for this PEP.

-Em