fix: lookup arity

[erdos]

stencil throws an exception when access with [] and with dotted form is mixed in a single expression, like in x[y].z.

TODO:

• check if it breaks variable name enumeration

[codecov]

Codecov Report

Merging #127 (14a7ae9) into master (04586c1) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #127      +/-   ##
==========================================
- Coverage   93.07%   93.00%   -0.08%     
==========================================
  Files          25       25              
  Lines        1893     1902       +9     
  Branches      107      108       +1     
==========================================
+ Hits         1762     1769       +7     
- Misses         24       25       +1     
- Partials      107      108       +1     

Impacted Files	Coverage Δ
src/stencil/infix.clj	98.38% <100.00%> (+0.04%)	⬆️
src/stencil/functions.clj	87.17% <0.00%> (-0.83%)	⬇️
src/stencil/cleanup.clj	92.75% <0.00%> (-0.73%)	⬇️
src/stencil/ooxml.clj	100.00% <0.00%> (ø)

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[erdos]

Will be addressed in #144