Fix deprecation in the interpolator

[roxblnfk]

No description provided.

[puzzledpolymath]

Away from my desk and reviewing this from my phone, but my first thought when seeing the changes was that the case statement should be:

‘case isset($key) && \array_key_exists($key, $named):’

[roxblnfk]

Agree :)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.53%. Comparing base (3d7ee35) to head (81b4253).
⚠️ Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x     #238      +/-   ##
============================================
+ Coverage     95.42%   95.53%   +0.11%     
  Complexity     1896     1896              
============================================
  Files           131      131              
  Lines          5285     5285              
============================================
+ Hits           5043     5049       +6     
+ Misses          242      236       -6     

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