SE-0379: Opt-In Reflection Metadata

However I wonder if the implied change of behaviour for the output of print() wouldn't end up being source-breaking in practice. It might be preferable if the strip-all-but-Reflectable behaviour remained gated by a flag even in Swift 6 mode.

This was raised several times that developers shouldn't rely on debugging output, for example in a recent decision on SE-369.

The language workgroup is keen to re-emphasize the point made in the proposal that, in line with the nature of debugging output, users should not rely on the best-effort result to be consistent either across platforms or across time on any specific platform

The paragraph entitled "Stdlib behavior changes" appears to explain why no changes in current stdlib behaviour are proposed. Given that, would it be clearer to simply title the paragraph "No stdlib behavior changes"?

This makes sense, fixed in this PR

Thanks for fixing typos!