Fix display of binary data

[Dreamsorcerer]

No description provided.

[codecov]

Codecov Report

Merging #759 (1abdbfa) into master (349df58) will increase coverage by 0.13%.
The diff coverage is 96.29%.

@@            Coverage Diff             @@
##           master     #759      +/-   ##
==========================================
+ Coverage   97.22%   97.35%   +0.13%     
==========================================
  Files          14       14              
  Lines        2051     2078      +27     
  Branches      322      327       +5     
==========================================
+ Hits         1994     2023      +29     
+ Misses         28       26       -2     
  Partials       29       29              

Flag	Coverage Δ
unit	97.30% <96.29%> (+0.13%)	⬆️

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Files Changed	Coverage Δ
aiohttp_admin/backends/abc.py	95.07% <50.00%> (+0.04%)	⬆️
tests/test_backends_sqlalchemy.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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