Demonstrate trait-based constructor overloading

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 48 lines in your changes are missing coverage. Please review.

Project coverage is 97.90%. Comparing base (b336ef4) to head (ae9b062).

Files	Patch %	Lines
crates/lox-time/src/scratch.rs	0.00%	48 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #95 +/- ## ========================================== - Coverage 98.14% 97.90% -0.24% ========================================== Files 56 57 +1 Lines 19601 19649 +48 ========================================== Hits 19237 19237 - Misses 364 412 +48 ```

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[helgee]

Superseded by #102