Debug command that can be used to evaluate a moonblade expression.
Usage:
xan eval [options] <expr>
xan eval --help
eval options:
-s, --serialize Serialize the value in CSV.
-e, --explain Print concrete expression plan.
-H, --headers <names> Pretend headers, separated by commas, to consider.
-R, --row <values> Pretend row with comma-separated cells.
Common options:
-h, --help Display this message