Possible integer parsing issue

[mschubert]

I just ran into a potential issue with integer parsing, when combing reading and writing of the yaml R package with other packages/languages.

According to the yaml integer specification:

Any “_” characters in the number are ignored, allowing a readable representation of large values

However, if I yaml::write_yaml(list("1_2_3"=4), file="test.yaml") this gives me the following resulting file:

1_2_3: 4.0

If I read this with with another parser (e.g., in Python) I will get a {123: 4}, where the 123 key is an integer.

To be safe, should the package maybe quote all "integer and underscores" keys/values?

[spgarbet]

This is odd. The parser is a 1.1 parser which this was an extension that should be supported. I am treating this as a bug. Reference specification: https://yaml.org/type/int.html

Note: If the 1.2 conversion is ever completed, underscores in integers is no longer in specification. I would recommend against using this feature of 1.1. Some YAML 1.2 parsers are supporting it, although this is outside of the current specification.