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px1999

I understand the idea of supporting ranges of libraries from a development perspective, but when you're running something in production, is "use any of these configurations" ever desirable?

Presumably there's a reason that you'd _want_ them to use 1.12.4 over 1.0.0 (or you'd want to at least check that they didn't break anything that you rely on in 1.13 when that comes out)?

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It's desirable if you're really focused on performance – if you're not a site like Google/Facebook which people access all the time, it's safe to assume that none of your resources are cached and so you might find n milliseconds of load time a healthy gain (less so now that HTTP/2 is widespread). In many cases it's more likely that you'd know of a bug fixed in a new release – where you'd say libfoo >= 1.12.4 – than that 1.3 has a huge problem.

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