Make SingletonMap public

[asomers]

It can be used in cases where #[serde(with = "singleton_map")] is too restrictive, for example where custom with modules are required.

Fixes #1

[acatton]

This pull request is great, documentation and everything.

However, I can't guarantee that this API will be maintained once I stabilize the whole crate. I hijacked your pull request and added a warning in the documention.

As I said in the documentation, this API won't be replaced without providing an alternative solution to the original problem described in #1 .

In the mean time this will get merged and I'll craft a new minor release. I don't want to block you, I'm just giving you a heads up: this API might break, but I'll deprecate it one version before removing it, and give an alternative solution to your problem.

Best case scenario, I can't find a better alternative to your API, and it becomes part of my plan for serde-yaml-ng 1.0.

[acatton]

This was released in https://crates.io/crates/serde_yaml_ng/0.10.0

[asomers]

Thanks very much @acatton! BTW, another solution to the same problem would be support for nested enums, as described here: dtolnay/serde-yaml#405 .

[acatton]

Ahh! Thanks for the hint @asomers I want to look deeper into this (See #6 ) once I get a good grasp of this part of the code.

You'll know if I change my mind when your code starts spitting out deprecation warnings 😁 .

Cheers!