That's what I said — you don't say 1.8.0, you say 1.8. But a 1.8 release does not mean the 1.8 release. It could be the 1.8.4 release. Hence the potential for confusion.
And I do agree that there is no point in modifying already-released installers. I didn't mean you should do that. For, say, a 1.9 release, that could be worthwhile, of course that is assuming the error messages are easily modifiable which may not be true.
If you measure 2.00001 ml then that's clearly different from 2.0 ml. The latter has an implied uncertainty of like ±0.05 ml and for the former it's ±0.000005 ml (not exactly like that but it shows the idea).