[no-explicit-generics] False positive when the generic isn't *exactly* the infered type

[Samuel-Therrien-Beslogic]

See the below example:
private readonly mySubject = new BehaviorSubject<string | undefined>(undefined)
Results in Explicit generic type arguments are forbidden. Despite the generic being necessary to specify the full type here.

A possible workaround is to cast the subject's initial value:
private readonly mySubject = new BehaviorSubject(undefined as string | undefined)
But we find specifying generics to be preferable over casting.

I remember reading some time ago about adding some sort of unnecessary generic check as part of typescript-eslint itslef. There was a mention of current limitations with TypeScript or using complicated (and slower) AST checks. So I understand if such false-positives may not be possible to detect.
Edit: typescript-eslint/typescript-eslint#4978 (comment)