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There are very good alternatives to csv for storing and exchanging floating point/other data.

The HDF5 format is very good and allows far more structure in your files, as well as metadata and different types of lossless and lossy compression.

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The lack of concurrent access support in the official HDF5 library (the only implementation with full format support) can be a major drawback. There is ongoing work on that front [1] though it's unclear when it will land.

[1] https://github.com/LifeboatLLC/MT-HDF5

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