fix as

[cscherrer]

Fixes #342

[codecov]

Codecov Report

Merging #348 (1a286fb) into master (80dfca9) will decrease coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #348      +/-   ##
==========================================
- Coverage   35.10%   35.01%   -0.10%     
==========================================
  Files          62       62              
  Lines        1809     1808       -1     
==========================================
- Hits          635      633       -2     
- Misses       1174     1175       +1     

Impacted Files	Coverage Δ
src/primitives/as.jl	57.77% <100.00%> (-3.10%)	⬇️

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