Improve delete behaviour

[ReflectiveObsidian]

Now, invalid format will have detailed explanations.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.14%. Comparing base (e3bcceb) to head (ddda3e1).

❗ Current head ddda3e1 differs from pull request most recent head ecf7203. Consider uploading reports for the commit ecf7203 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #197      +/-   ##
============================================
+ Coverage     74.08%   74.14%   +0.06%     
  Complexity      837      837              
============================================
  Files           108      108              
  Lines          2709     2704       -5     
  Branches        361      359       -2     
============================================
- Hits           2007     2005       -2     
- Misses          603      604       +1     
+ Partials         99       95       -4     

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[Bandov]

LGTM