add default ttl of 0 to fix breaking change

[arilotter]

closes #2057

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (19c55bd) 30.86% compared to head (665cf67) 30.72%.

Files	Patch %	Lines
src/config.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2058      +/-   ##
==========================================
- Coverage   30.86%   30.72%   -0.15%     
==========================================
  Files          52       52              
  Lines       19717    19717              
  Branches     9488     9491       +3     
==========================================
- Hits         6086     6058      -28     
- Misses       7910     7923      +13     
- Partials     5721     5736      +15     

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[sylvestre]

it would be nice to have a test to make sure we don't regress in the future!