add accessor extension methods

[gregsdennis]

Resolves #668

[github-actions]

Test Results

    14 files  ±0      14 suites  ±0   11s ⏱️ ±0s
20 453 tests ±0  19 090 ✅ ±0  1 363 💤 ±0  0 ❌ ±0 
20 545 runs  ±0  19 179 ✅ ±0  1 366 💤 ±0  0 ❌ ±0 

Results for commit 9ca770c. ± Comparison against base commit 8c5eaf7.

This pull request removes 13 and adds 4 tests. Note that renamed tests count towards both.

    "other string"
    "string",
    42
  "foo": 42
  "foo": [
  42
  ]
Json.JsonE.Tests.TruthyTests ‑ IsTruthy([
Json.JsonE.Tests.TruthyTests ‑ IsTruthy({
Json.Schema.Tests.CrossDraftTests ‑ ArrayItemsIsAllowedForDraft7({
…

Json.JsonE.Tests.TruthyTests ‑ IsTruthy([
  42
],True)
Json.JsonE.Tests.TruthyTests ‑ IsTruthy({
  "foo": 42
},True)
Json.Schema.Tests.CrossDraftTests ‑ ArrayItemsIsAllowedForDraft7({
  "foo": [
    "string",
    "other string"
  ]
},False)
Json.Schema.Tests.CrossDraftTests ‑ ArrayItemsIsAllowedForDraft7({
  "foo": [
    "string",
    42
  ]
},True)

♻️ This comment has been updated with latest results.