Fix HashableProp tests

[ljeub-pometry]

What changes were proposed in this pull request?

• The proptest for HashableProp was using equality checks on Prop instead of HashableProp
• Add explicit tests for the floating point edge cases (these were all handled correctly)

Why are the changes needed?

spurious test failure

Does this PR introduce any user-facing change? If yes is this documented?

How was this patch tested?

Are there any further changes required?

[github-actions]

⚠️ Performance Alert ⚠️

Possible performance regression was detected for benchmark 'Rust Benchmark'.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 2.

Benchmark suite	Current: ab4072f	Previous: 9823ef7	Ratio
lotr_graph/num_edges	3 ns/iter (± 0)	0 ns/iter (± 0)	+∞
lotr_graph/num_nodes	4 ns/iter (± 0)	1 ns/iter (± 0)	4
lotr_graph/graph_latest	2 ns/iter (± 0)	0 ns/iter (± 0)	+∞
lotr_graph_materialise/materialize	6378174 ns/iter (± 286615)	1564816 ns/iter (± 35303)	4.08
lotr_graph_window_100_materialise/materialize	5897647 ns/iter (± 410505)	1669150 ns/iter (± 10700)	3.53
lotr_graph_window_10_materialise/materialize	2725822 ns/iter (± 108931)	971980 ns/iter (± 4278)	2.80
lotr_graph_subgraph_10pc/num_nodes	12 ns/iter (± 0)	4 ns/iter (± 0)	3
lotr_graph_subgraph_10pc_materialise/materialize	1878513 ns/iter (± 17713)	334634 ns/iter (± 1287)	5.61
lotr_graph_subgraph_10pc_windowed_materialise/materialize	1176802 ns/iter (± 38889)	230399 ns/iter (± 2617)	5.11
lotr_graph_window_50_layered/has_node_existing	273 ns/iter (± 19)	129 ns/iter (± 12)	2.12
lotr_graph_window_50_layered_materialise/materialize	20332050 ns/iter (± 591666)	3488825 ns/iter (± 24948)	5.83
lotr_graph_persistent_window_50_layered/num_edges_temporal	399580 ns/iter (± 21768)	192686 ns/iter (± 1569)	2.07
lotr_graph_persistent_window_50_layered_materialise/materialize	38059427 ns/iter (± 1304986)	5298035 ns/iter (± 147912)	7.18

This comment was automatically generated by workflow using github-action-benchmark.