[RFC] Add `isIdentical` Methods to Concrete Types

[vanvoorden]

Draft Proposal

NNNN-add-is-identical-methods.md

Current Progress

	Impact	Volunteer	Diff
String	★ ★ ★ ★ ★	@vanvoorden	swiftlang/swift#82055
Substring	★ ★ ★ ★ ★	@vanvoorden	swiftlang/swift#82055
Array	★ ★ ★ ★ ★	@vanvoorden	swiftlang/swift#82438
ArraySlice	★ ★ ★ ★ ★	@vanvoorden	swiftlang/swift#82438
ContiguousArray	★ ★ ★ ★ ★	@vanvoorden	swiftlang/swift#82438
Dictionary	★ ★ ★ ★ ★	@vanvoorden	swiftlang/swift#82439
Set	★ ★ ★ ★ ★	@vanvoorden	swiftlang/swift#82439
Character	---	---	---
String.UnicodeScalarView	---	---	---
String.UTF16View	---	---	---
String.UTF8View	---	---	---
StaticString	---	---	---
StaticBigInt	---	---	---
KeyValuePairs	---	---	---
Substring.UnicodeScalarView	---	---	---
Substring.UTF16View	---	---	---
Substring.UTF8View	---	---	---
Dictionary.Keys	---	---	---
Dictionary.Values	---	---	---
UTF8Span	---	---	---

Request for Help

Please leave a comment if you can help provide any more details on these types that are not yet implemented:

• Are we missing a type?
  • What else might be appropriate for this proposal?
• What is the impact of this type?
  • How important is it we ship this type as soon as possible on Standard Library?
• Are you willing to volunteer to write the implementation?
  • Are you available to complete tests and benchmarks?
  • Are you available to answer implementation questions on this type from engineers during diff review?
  • Are you available to answer design questions on this type from engineers during proposal review?