sfc objects

0.6.2 returns an unnamed list for XY, and a named list for XYZ[M] sfc objects.

Should the both be made consistent, and / or return an sfencoded object?

library(sf)

encode( sf::st_sfc(sf::st_point(1:2) ) )

# [[1]]
# [1] "_seK_ibE"
# attr(,"sfc")
# [1] "POINT"

encode( sf::st_sfc(sf::st_point(1:3) ) )

# $XY
# $XY[[1]]
# [1] "_seK_ibE"
# attr(,"sfc")
# [1] "POINT"
# 
# 
# $ZM
# $ZM[[1]]
# [1] "?_}hQ"
# attr(,"zm")
# [1] "XYZ"

related #15