Parsley 4.2.12

Mostly, this release has internal infrastructure changes ahead of future improvements in 4.3 and beyond. However, #194 was fixed, in #196, which adds a couple of guarantees to the error formatting to ensure that a parser input demand of 0 is never provided to token extraction.

What's Changed

• Support for partial dislodging by @j-mie6 in #191
• Partial Amending by @j-mie6 in #195
• Prevent zero-width tokens from being formatted by @j-mie6 in #196
• Generalise empty in internals by @j-mie6 in #197
• Multiple labels in errors by @j-mie6 in #198

Full Changelog: v4.2.11...v4.2.12