- CsvInt.x -> CsvInt.a
- CsvFloat.x -> CsvFloat.a
- Rev.x -> Rev.a
This matches CsvFrac.a (paired with CsvFrac.b), and avoids confusion
with x/y variables such as Tile.x and Tile.y.
The other contender was .v, since these are cs*v* related types, but
sticking with .a gets the point across that the name really doesn't have
any meaning.
There's also some irony that we're forcing namedtuples to have
meaningless names, but it is useful to have a quick accessor for the
internal value.
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