GHCi: buggy terminal behaviour on Apple Silicon

Summary

I'm not entirely sure if this is the right place to put this -- apologies if not. I'm requesting that this issue be marked with the 8.10.8 milestone, so the submodule for libraries/terminfo can be bumped to 0.4.1.5 in the next minor 8.10 release. I've got a patched version of 8.10.7 on my current system, and I can confirm that bumping terminfo is all that's necessary to fix the issue described below.

Steps to reproduce

• Run GHCi on any ARM mac
• type a line of some sort
• issue ^A

Expected behavior

Cursor moves to the start of the line

Actual behavior

• Cursor moves one character to the left
• the current line and some adjacent start getting overwritten with garbage on further input

For some reason, this can be worked around by setting TERM=dumb.

Environment

• GHC version used: 8.10.7

Optional:

• Operating System: macOS 12.0.1
• System Architecture: arm64