Fix case when numeric inference kicks out before minimal tautology inference

[ChernikovP]

Attempt to address #613.

Basically, numeric inference kicks in before minimal tautology.

scala> implicitly[Inference[Positive And Less[10], Positive]]
val res0: /* ... */ = Inference(false,conjunctionEliminationL(greaterInferenceNat(0, 0)))

or even simpler:

scala> implicitly[Inference[Positive, Positive]]
val res1: /* ... */  = Inference(false,greaterInferenceNat(0, 0))

[codecov]

Codecov Report

Merging #894 (3d1b04c) into master (ac4a55f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #894   +/-   ##
=======================================
  Coverage   91.52%   91.52%           
=======================================
  Files          48       48           
  Lines         531      531           
  Branches       12        8    -4     
=======================================
  Hits          486      486           
  Misses         45       45           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ac4a55f...3d1b04c. Read the comment docs.