Inconsistent method specialization/overwriting with kwargs gives no warnings

[KnutAM]

This is also shown in issue #9498, but that issue is set for 2.0. The issue here is for possible intermediate solutions to prevent bug introduction in codes caused by re-ordering of function definitions.

f1(a,b)="no extra";f1(a,b;kwargs...) = ";kwargs..."; (f1(1,1), f1(1,1,k=1))

gives (";kwargs...", ";kwargs..."). And methods(f1) gives 1 method. So this is consistent with the last definition overwriting the first. However,

f2(a,b;kwargs...) = ";kwargs..."; f2(a,b)="no extra"; (f2(1,1), f2(1,1,k=1))

gives ("no extra", ";kwargs..."). But methods(f2) still gives 1 method. Yet, it does not seem like the last definition overwrote the first. So I see two problems:

1. The output of methods seems wrong?
2. It seems unstable that overwriting only occurs when the kwargs version comes last, but not the other way around?

As I understood from #9498, these are not possible to solve without introducing breaking changes and will not be solved in 1.x?
However, it would still be nice to (at least untill #9498 is solved) have some warning or similar to highlight that these patterns might easily introduce bugs.

(Tested on 1.6.2 and 1.7.0-beta4)