fail fast

[christopher-henderson]

Address #8

[codecov-io]

Codecov Report

Merging #7 into main will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #7   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         5    +1     
  Lines          525       556   +31     
  Branches        68        69    +1     
=========================================
+ Hits           525       556   +31     

Impacted Files	Coverage Δ
pstream/async_stream.py	100.00% <100.00%> (ø)
pstream/defensive.py	100.00% <100.00%> (ø)
pstream/errors.py	100.00% <100.00%> (ø)
pstream/stream.py	100.00% <100.00%> (ø)

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