DataFrame.fastCSV

from_csv rebuild for faster read

struct DataFrame(FrameFields...)
void
fastCSV
(
string path
,
size_t indexDepth
,,
char sep = ','
)
if (
FrameFields.length > 0 &&
(
(
!isType!(FrameFields[0]) &&
is(typeof(FrameFields[0]) == bool)
&&
FrameFields[0] == true
&&
FrameFields.length > 1
)
||
isType!(FrameFields[0])
)
)

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