[Feature] Allow Unknown Options from all sources

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
42/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
cpp
Domain
cli

Research direction

Start with the documented allow_unregistered() behavior for command-line parsing, then compare how the configuration-file and environment parsers handle unknown options. Review the linked configuration and environment workarounds before deciding how the existing parsers should behave. Done means unknown options are handled consistently across all three sources without exceptions.

Written by the indexing model from the issue text.

Description

For the command line parser, there is the allow_unregistered() method to not throw an exception whenever an option is not recognized.

However, this is missing from the configuration file and environment parsers.

It is possible to do work around this for both configuration files and environment, but I am of the opinion this should be handled in similar fashion to the command line parsers!

Dominant language
C++
Stars
136
Forks
117
No merged PRs in 30d

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