bug#40407: [PATCH] slow ENCODE_FILE and DECODE_FILE

[Mattias Engdegård]

4 apr. 2020 kl. 19.04 skrev Eli Zaretskii <eliz@gnu.org>:

> How so?

Because then NOCOPY suddenly matters for almost all coding systems, not just 
nil. After all, an all-ASCII input string and ASCII-compatible coding is not an 
unusual combination. This forces us to be careful when correcting the NOCOPY 
sense, and may expose latent bugs.

But you are right: we should trust calls to {en,de}code-coding-system with 
NOCOPY=t, and the rest can also remain as they are until someone cares enough 
to change them.