Support real / imag for expansions

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 96.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.08%. Comparing base (8e30083) to head (5f8bb0f).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/bases/bases.jl	94.73%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #225       +/-   ##
===========================================
+ Coverage    0.00%   93.08%   +93.08%     
===========================================
  Files          12       12               
  Lines         917     1012       +95     
===========================================
+ Hits            0      942      +942     
+ Misses        917       70      -847     

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