lots of minor updates

[gregsdennis]

Resolves #417
Resolves #406 (relates to dotnet/runtime#83547)

[github-actions]

Test Results

       12 files  ±  0       12 suites  ±0   13s ⏱️ -1s
10 245 tests +17  9 516 ✔️  - 43  729 💤 +60  0 ❌ ±0 
10 596 runs  +17  9 822 ✔️  - 43  774 💤 +60  0 ❌ ±0 

Results for commit 23b5f4b. ± Comparison against base commit 44d5fe8.

This pull request skips 60 tests.

Json.Schema.Tests.Suite.Validation ‑ draft-next / date / (optional) / validation of date strings / 2021 is not a leap year
Json.Schema.Tests.Suite.Validation ‑ draft-next / date / (optional) / validation of date strings / a invalid date string with 29 days in February (normal)
Json.Schema.Tests.Suite.Validation ‑ draft-next / date / (optional) / validation of date strings / a invalid date string with 30 days in February (leap)
Json.Schema.Tests.Suite.Validation ‑ draft-next / date / (optional) / validation of date strings / a invalid date string with 31 days in April
Json.Schema.Tests.Suite.Validation ‑ draft-next / date / (optional) / validation of date strings / a invalid date string with 31 days in June
Json.Schema.Tests.Suite.Validation ‑ draft-next / date / (optional) / validation of date strings / a invalid date string with 31 days in November
Json.Schema.Tests.Suite.Validation ‑ draft-next / date / (optional) / validation of date strings / a invalid date string with 31 days in September
Json.Schema.Tests.Suite.Validation ‑ draft-next / date / (optional) / validation of date strings / invalid month-day combination
Json.Schema.Tests.Suite.Validation ‑ draft-next / date / (optional) / validation of date strings / invalid non-ASCII '৪' (a Bengali 4)
Json.Schema.Tests.Suite.Validation ‑ draft-next / date / (optional) / validation of date strings / only RFC3339 not all of ISO 8601 are valid
…

♻️ This comment has been updated with latest results.