suggest to change default quote parameter for tsv

[jhpoelen]

In IANA's definition of TSV at https://www.iana.org/assignments/media-types/text/tab-separated-values , no mention is made of string quoting. In fact, the reason for the use of TSV was to avoid having to deal with confusing string quoting at all by simply stating the tab character may not be used in the values of fields.

Currently, the default value of "quote" parameter in readr::read_tsv is \".

To follow the spirit of TSV, suggest to change the default value of the "quote" parameter in readr:read_tsv (and accompanying methods) to an empty value.

[jimhester]

This seems reasonable to me, do you have an opinion @hadley?

[hadley]

Hmmm, I'd be slightly concerned about breaking existing code, but it seems like it should be ok.

[cboettig]

@jimhester I think this issue also impacts write_tsv()? Looks like readr cannot write a IANA valid tsv file with quoted text, since there's not even an option(?) to not double-quote quotations?

[jhpoelen]

@jimhester @hadley would you consider a pull request on this topic?

[jimhester]

@cboettig there is now a escape_na option for the write_*() functions, so at least that concern is removed.