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Change unparsed enums from u32 to u16.
This reduce the RawStopTime's size from 136 to 120.
I think unparsed values are still quite high (and higher that 65536 will trigger an error on the row, so not a huge deal).
On the FR IDF dataset, memory consumption goes from 3.9G to 3.4G.
Don't really know if the reduce value range is a problem on real datasets though