The CRS handling in the wk package requires two sentinel CRS values.
wk_crs_inherit(), signals that the vector should inherit
a CRS of another vector if combined. This is useful for empty,
and/or zero-length geometries. The second,
wk_crs_auto(), is used
as the default argument of
crs for constructors so that zero-length
geometries are assigned a CRS of
wk_crs_inherit() by default.
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A raw input to a construuctor whose length and crs attributte
is used to determine the default CRS returned by
A value for the coordinate reference system supplied by the user.
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