#[prop(default)] uses Default::default(), unless specified.

[k1rowashere]

#[prop(default)] now acts as #[prop(default = Default::default())].

• with appropriate test changes

[gbj]

What's the reasoning here? Isn't this what #[prop(optional)] already does?

[k1rowashere]

It was just more intuitive to me.
I didn't realize at first that optional worked on non-option types.
Sure, it is a duplication of features but I don't think it has a reason not to work.

[gbj]

Fair enough. I'd suggest editing it so that #[prop(default)] without an argument is just interpreted as #[prop(optional)], for the sake of reducing maintenance burden/not adding additional code.

[k1rowashere]

Sadly, the attribute_derive crate doesn't provide attribute aliases, and it will error out if the attribute is not given a value, unless the as_flag method from ConvertParsed is overridden and returns a Some(syn::Expr) instead of None.

It might be possible to merge the implementations of optional and default, but I think it would be more cumbersome/ requires more code.

[tqwewe]

+1 for this.
In the past I've done #[prop(default)] and it failed because I also assumed it would use Default::default().

Perhaps in 0.6 #[prop(into)] could even be removed/deprecated in favor of having fewer #[prop(...)] variants - though not sure if people would agree with this