Fix numerical precision issue on final closed bin interval #304
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The bin0 column for values on the closing bin didn't always match the bin0 for values in the final interval.
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Fixes an issue that came up with only the duckdb backend. The MRE test case is included in the PR.
The issue is that the bin0 column produced by the bin transform for values on the closing bin edge didn't always match the bin0 for values in the final interval, due to numeric precision differences between duckdb and Rust/DataFusion.