Update IsNumericFilter.php

[G4Zz0L1]

Fixes issues 2229

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests and did you add any new tests needed for your feature?
2. Did you update all templates (if applicable)?
3. Did you add the relevant documentation (if applicable)?
4. Did you test locally to make sure your feature works as intended?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

[lrljoe]

Thanks, I will review this week, apologies but I've been on holiday

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.96%. Comparing base (0036a9a) to head (28efa5a).
Report is 34 commits behind head on development.

Additional details and impacted files

@@                Coverage Diff                @@
##             development    #2230      +/-   ##
=================================================
+ Coverage          89.94%   89.96%   +0.02%     
- Complexity          2149     2154       +5     
=================================================
  Files                242      242              
  Lines               4851     4853       +2     
=================================================
+ Hits                4363     4366       +3     
+ Misses               488      487       -1     

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[lrljoe]

Looking at this over this weekend