Fix BroadcastLayout{typeof(-)} ambiguity

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Merging #108 (9213fe2) into master (594d81c) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
+ Coverage   90.50%   90.69%   +0.19%     
==========================================
  Files           7        7              
  Lines         516      516              
==========================================
+ Hits          467      468       +1     
+ Misses         49       48       -1     

Impacted Files	Coverage Δ
src/bases/bases.jl	92.76% <100.00%> (+0.45%)	⬆️

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