Decoding data that implement FromStr from either a string or an object

[hauleth]

I want to use Facet with my fuk tool that reads configuration out of TOML file and then fetches the SSH keys using that as an input. The thing there is that sometimes I want to decode data from a string or an object, depending what is an input. In this project I am supporting Tangled to be defined as:

keys = [
  { tangled = "@hauleth.dev" }
]

Or

keys = [
  { tangled = { host = "https://bsky.social/", handle = "@hauleth.dev" } }
]

Serde supports that with some footwork. However I haven't found how to implement similar thing with Facet.

I am trying to find a way to port this small tool (500 LoC), but so far I couldn't find how to make Facet happy.

[tversteeg]

Converted to a issue in #610.