Fix method ambiguity issues

[devmotion]

Alternative to #120 which keeps the current functionality.

@torfjelde Do you have a MWE of the ambiguity issues? Or can confirm that this PR would fix the issues you ran into?

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 🎉

Comparison is base (e149f9f) 97.33% compared to head (ffb7b43) 97.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
+ Coverage   97.33%   97.37%   +0.04%     
==========================================
  Files           8        8              
  Lines         300      305       +5     
==========================================
+ Hits          292      297       +5     
  Misses          8        8              

Impacted Files	Coverage Δ
src/interface.jl	95.45% <100.00%> (+0.45%)	⬆️

... and 2 files with indirect coverage changes

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[torfjelde]

I'll have to dig out those examples; it's been a while. But will try to get around to it sometime today.

[devmotion]

Were you able to find (and run?) the examples?

[torfjelde]

No, sorry haven't done it yet. The original examples in #120 are from MCMCTempering.jl which I haven't done in a while. This PR most certainly helps with the overall issue we've discussed, whether or not it actuallly solves the particular ambiguity I ran into.

[devmotion]

Should we merge then maybe merge the PR and revisit #120 (or some variant) if problems show up again?

[torfjelde]

I'm happy with that:) I have NeurIPS reviews over the next few weeks, but once that's done I'll revisit MCMCTempering, and so might be able to provide some cases in #120 then 👍 But for now, let's just merge this.

[torfjelde]

Thanks David:)