Re: [whatwg/webidl] Require a default value for optional dictionary member of another dictionary? (Issue #1511)

kainino0x left a comment (whatwg/webidl#1511)

There are probably details in WebIDL that I don't understand, but this seems consistent with #602 already. My understanding - please check if this is correct - is:

- In a dictionary:
  - `dictionary Foo { Bar bar = {}; };` means that Foo `{}` == `{ bar: undefined }` == `{ bar: {} }`
  - `dictionary Foo { Bar bar; }; ` means that Foo `{}` == `{ bar: undefined }`, distinct from `{ bar: {} }`
- In a function:
  - `foo(optional Bar bar = {});` means that `foo()` == `foo(undefined)` == `foo({})`
  - `foo(optional Bar bar);` is not valid syntax

I'm also not entirely sure how this connects with needing to allow Foo `{ bar: false }` or `{ bar: true }` which we were discussing for `GPUBindGroupLayoutEntry`.

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