feat: add a safe object factory demo

[moul]

Related #1913

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.68%. Comparing base (de2fc45) to head (4bf8963).
Report is 463 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2000      +/-   ##
==========================================
+ Coverage   45.62%   46.68%   +1.05%     
==========================================
  Files         445      492      +47     
  Lines       66233    69682    +3449     
==========================================
+ Hits        30219    32531    +2312     
- Misses      33521    34437     +916     
- Partials     2493     2714     +221     

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[github-actions]

This PR is stale because it has been open 3 months with no activity. Remove stale label or comment or this will be closed in 3 months.