enhancement for PR #1387: evaluate const across packages

[sdghchj]

Describe the PR
Enhancement for PR #1387: evaluate const across packages

Relation issue
#1367

[codecov]

Codecov Report

Base: 95.60% // Head: 95.20% // Decreases project coverage by -0.39% ⚠️

Coverage data is based on head (4c3e8af) compared to base (e6723fe).
Patch coverage: 85.18% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1388      +/-   ##
==========================================
- Coverage   95.60%   95.20%   -0.40%     
==========================================
  Files          16       15       -1     
  Lines        3023     3048      +25     
==========================================
+ Hits         2890     2902      +12     
- Misses         74       84      +10     
- Partials       59       62       +3     

Impacted Files	Coverage Δ
packages.go	89.93% <79.06%> (-2.14%)	⬇️
package.go	88.29% <85.13%> (-11.71%)	⬇️
gen/gen.go	93.48% <100.00%> (+0.03%)	⬆️
generics.go	100.00% <100.00%> (ø)
generics_other.go	100.00% <100.00%> (ø)
parser.go	94.03% <100.00%> (+0.03%)	⬆️

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[nicolasassi]

LGTM