"Name non-constant identifiers using lowerCamelCase" should ignore all-underscore identifiers

[Hixie]

For "Name non-constant identifiers using lowerCamelCase", the only reason we have that excluded is that it prevents the name __ (double underscore). We use _, __, ___, etc, to represent arguments that we're intentionally ignoring in callbacks. Those are the only cases where we want to allow the type to be omitted, and are the only cases where we want the identifiers to not be lowerCamelCase.

History: See #24452 (comment)

[zoechi]

see also #57233