Logic/functional

[gregsdennis]

Added a new "functional," model-less implementation.

Benchmark shows considerable improvement over the existing implementation.

| Method | Count | Mean         | Error       | StdDev      | Gen0       | Allocated   |
|------- |------ |-------------:|------------:|------------:|-----------:|------------:|
| Models | 1     |   1,655.9 us |    26.76 us |    26.28 us |   410.1563 |   838.03 KB |
| Nodes  | 1     |     734.5 us |     8.16 us |     7.23 us |   236.3281 |   482.61 KB |
| Models | 10    |  16,269.0 us |   167.06 us |   139.50 us |  4093.7500 |   8380.5 KB |
| Nodes  | 10    |   7,210.7 us |    25.26 us |    21.09 us |  2359.3750 |  4826.08 KB |
| Models | 100   | 164,267.3 us | 2,227.54 us | 1,974.66 us | 41000.0000 | 83803.81 KB |
| Nodes  | 100   |  72,195.7 us |   139.28 us |   116.30 us | 23571.4286 | 48262.05 KB |

Models is the current implementation; Nodes is the new one.

Will be updating the docs for using this approach, and I think this deserves a blog post.

Relates (tangentially) to #552.

[github-actions]

Test Results

    15 files      15 suites   12s ⏱️
21 041 tests 19 681 ✅ 1 360 💤 0 ❌
21 133 runs  19 770 ✅ 1 363 💤 0 ❌

Results for commit 282a9e1.

♻️ This comment has been updated with latest results.