Function tantivy_common::i64_to_u64
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Maps a i64 to u64
For simplicity, tantivy internally handles i64 as u64.
The mapping is defined by this function.
Maps i64 to u64 so that
-2^63 .. 2^63-1 is mapped
to
0 .. 2^64-1
in that order.
This is more suited than simply casting (val as u64)
because of bitpacking.
Imagine a list of i64 ranging from -10 to 10.
When casting negative values, the negative values are projected
to values over 2^63, and all values end up requiring 64 bits.