Support for non-default standard input about linedit

[SquircleSpace]

Here are some more details.

My standard input is backed by a file descriptor, and I can produce that fd when needed. Notably, standard input might not be backed by fd 0. Throughout the lifetime of the program, standard input might end up being backed by different file descriptors, but it won’t change while reading input from the user. So, in any given invocation of linedit, the file descriptor is constant.

Would my use case be hard to support? Are there any sharp edges I need to look out for?