Add option for using generators for instance check

[hoxbro]

And remove direct numpy import

[codecov]

Codecov Report

Attention: Patch coverage is 93.87755% with 3 lines in your changes missing coverage. Please review.

Project coverage is 86.53%. Comparing base (e54dd51) to head (c5f6d08).

Files with missing lines	Patch %	Lines
param/_utils.py	87.50%	1 Missing ⚠️
param/parameterized.py	96.42%	1 Missing ⚠️
param/parameters.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #966      +/-   ##
==========================================
+ Coverage   86.45%   86.53%   +0.08%     
==========================================
  Files          10       10              
  Lines        5176     5193      +17     
==========================================
+ Hits         4475     4494      +19     
+ Misses        701      699       -2     

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