fix: always update bound functions. #949

[theKashey]

See #949, but better - test case in this PR.

[codecov-io]

Codecov Report

Merging #950 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #950      +/-   ##
==========================================
+ Coverage   88.11%   88.13%   +0.01%     
==========================================
  Files          30       30              
  Lines         673      674       +1     
  Branches      155      156       +1     
==========================================
+ Hits          593      594       +1     
  Misses         65       65              
  Partials       15       15

Impacted Files	Coverage Δ
src/proxy/inject.js	75.92% <100%> (+0.45%)	⬆️

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