pub const RAW_MARKER: char = '\u{0}';Expand description
Marker prefix for a value that must be emitted verbatim, unquoted.
Python writes non-finite floats as the bare tokens NaN, Infinity
and -Infinity. JSON has no syntax for them and serde_json::Number
cannot hold them, so they travel as strings carrying this prefix. A
NUL cannot occur in the data this serializes, which is what makes it
safe as a sentinel.