Document that aliases should be space separated (not comma). #1627
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address #1626. I have seen in the wild cases of persons who used commas for example.
r-spatial/sf#2285
See the defunct file https://github.com/r-spatial/sf/pull/2285/files#diff-089405beae4488e32546bbf6c68166873b65f29323ca65f621de30eb80154e53 as an example.