Expose error values

[at-wat]

Make it possible to compare errors using errors.Is().

Reference issue

Related #251

[codecov]

Codecov Report

Base: 80.87% // Head: 80.87% // No change to project coverage 👍

Coverage data is based on head (be53505) compared to base (7ca78e8).
Patch coverage: 28.15% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #259   +/-   ##
=======================================
  Coverage   80.87%   80.87%           
=======================================
  Files          48       48           
  Lines        4032     4032           
=======================================
  Hits         3261     3261           
  Misses        629      629           
  Partials      142      142           

Flag	Coverage Δ
go	80.87% <28.15%> (ø)
wasm	67.46% <19.41%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
chunk_abort.go	50.00% <0.00%> (ø)
chunk_cookie_ack.go	60.00% <0.00%> (ø)
chunk_cookie_echo.go	62.50% <0.00%> (ø)
chunk_error.go	50.00% <0.00%> (ø)
chunk_heartbeat.go	0.00% <0.00%> (ø)
chunk_heartbeat_ack.go	0.00% <0.00%> (ø)
chunk_init.go	36.36% <0.00%> (ø)
chunk_init_ack.go	37.50% <0.00%> (ø)
chunk_init_common.go	65.51% <0.00%> (ø)
chunk_selective_ack.go	66.66% <0.00%> (ø)
... and 19 more

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