I'd like to start a discussion regarding how we merge PRs in the future (such as after we get to 0.20 beta, for example) to make commit history more readable.

Why: Mega-commits (resulting from the current stash-the-whole-PR-into-one-commit setting) are hard to read, especially when hunting down regressions. Examples:

• 9602716 (Event Loop 2.0 API and Windows implementation (Event Loop 2.0 API and Windows implementation #638))
• d539168 (Squashed commit of the following: ([WIP] Macos Evlp2 #853))

On the other hand, I think squashing a handful of PR commits like "implemented foo" – "documented foo" – "oh, and changelog btw" into a single-commit merge is fine, as long as the resulting commit stays readable.