Use eigencopy_oftype instead of copy_oftype

[andreasnoack]

Fixes #139

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.10%. Comparing base (713250b) to head (dd2cede).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #140   +/-   ##
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  Coverage   96.10%   96.10%           
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  Files          11       11           
  Lines        1645     1645           
=======================================
  Hits         1581     1581           
  Misses         64       64           

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[andreasnoack]

So it looks like the eigencopy_oftype is a relatively recent invention and that eigvals(Hermitian(Diagonal(...)))) used to fail before it was introduced.