Array method definition revamp: Use case collection

We've gotten numerous issue reports and PRs to change the methods of Array, particularly reduce, map, and filter. The built-in test suite doesn't cover these very well, and these methods interact with each other and the surrounding contextual type in fairly subtle ways.

@jablko has done a great job at #33645 collecting a variety of issues into a single PR; we need to augment this PR (or something like this) with a proper test suite so we can be sure about what's being changed.

I'd like to create a clearinghouse issue here to collect self-contained (I CANNOT POSSIBLY STRESS THIS ENOUGH, SELF-CONTAINED, DO NOT IMPORT FROM RXJS OR WHAT HAVE YOU) code samples that make use of the array methods.

Please include with your snippet:

• Compiler settings
• Compiler version you were testing with
• The expected behavior (examples that should and should not produce errors are both useful)
• No imports or exports; snippets need to be self-contained so that we can put them into our test suite without extra complications

Once we've established a critical mass of code snippets, we can start combining the existing PRs into an all-up revamp and assess its impact to real-world code suites to figure out which changes don't result in unacceptable breaking changes.

ｓｅｌｆ－ｃｏｎｔａｉｎｅｄ

Bắt đầu bằng cách xem xét các ví dụ đã thu thập trong issue #36554 và PR liên quan #33645, tập trung vào các phương thức Array reduce, map và filter. Chỉ thêm các snippet độc lập có cài đặt trình biên dịch, phiên bản trình biên dịch và chẩn đoán dự kiến; công việc được hoàn thành khi đã có một tập hợp kiểm thử đủ rộng để định hướng cho việc cải tổ được đề xuất.