valuable-serde: consistency with serde

[taiki-e]

This is a list of cases where valuable-serde behaves differently from using serde directly.

• valuable/valuable-serde/tests/test.rs

  Lines 69 to 71 in 7a22d9d

  	// TODO:
  	// - valuable treats Option<T> as T or unit
  	// - serde treats Option<T> as Some(T) or None

  
  see also Implement valuable-serde #23 (comment)

• valuable/valuable-serde/tests/test.rs

  Lines 85 to 87 in 7a22d9d

  	// TODO:
  	// - valuable treats unit struct as an empty tuple struct
  	// - serde treats unit struct as unit struct

  
  see also Implement valuable-serde #23 (comment)

• valuable/valuable-serde/tests/test.rs

  Lines 103 to 105 in 7a22d9d

  	// TODO:
  	// - valuable treats unit variant as an empty tuple variant
  	// - serde treats unit variant as unit variant

[carllerche]

Is there a significant difference between a unit struct and an empty tuple struct?

[taiki-e]

I think it depends on the serializer. For example, in serde_json, tuple struct is treated as an array, unit struct is treated as a null, tuple variant is treated as an object, and unit variant is treated as a string.

https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=409ee982e15f2273597cc4016b54d82c