tree 3c7b603d5e3c00c2b6e66b4aabe06d6a050cd855
parent 73128fce442147366d41da7c547b533abd7f2aac
author Itai Ferber <iferber@apple.com> 1498851820 -0700
committer Itai Ferber <iferber@apple.com> 1498853221 -0700

Make coding paths non-optional

For the benefit of unkeyed containers, coding paths currently contain optional `CodingKey`s — unkeyed containers are allowed to report a `nil` key in a path. However, this is unhelpful for debugging purposes, or inspecting the coding path for context, since any unkeyed container simply reports `nil`, whether it’s at index 1 or 1000.

Now all containers are required to report a non-optional CodingKey for their segment of the coding path, and coding paths are now exposed as `[CodingKey]`.