[Yaml-core] What characters allowed in anchor names?

[William S. <sp...@rh...>]

According to the yaml 1.2 spec documentation, the characters allowed in 
an anchor name are all c-printable except space, tab, lf, cr, or one of 
",[]{}". This seems to be true even in older versions.

However the libyaml source I have is severely more restricted, to 
alphanumeric, dash, and underscore.

Which is correct?

Personally I would vote for allowing as many characters as possible.