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I would recommend always being explicit, especially with 2.0 and 2.1 as they're different enough to have been 2.0 and 3.0

runtime behavior is supposed to be identical, and it is in most cases (so far I have not run into any script behavior differences between 2.0 and 2.1 though I know some others have)

Correct me if I'm wrong, but it seems like if you distribute 2.1 code with the `2.x` tag, it's going to fail in any account where the setting says `2.x = 2.0`

all you need to do is change your target (in `tsconfig.json`) and recompile. Takes only a second and is an essentially no-risk activity.

hence for those of us using TS, the 2.0-&gt;2.1 was a non-event from a source code perspective. I've been using 2.1 constructs for quite a long while now, even in 2.0 targeted code. Compiling for 2.1 just means the output JS is mostly the same as the source TS