serde_yaml_gtc 2.5.2

Temp copy for serde_yaml_bw until version 2.5.2 is on crates. YAML support for Serde with an emphasis on panic-free parsing (including malformed YAML).
Documentation 
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use crate::mapping::Mapping;
use crate::value::{Number, Value};
use std::fmt::{self, Debug, Display};

impl Debug for Value {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        match self {
            Value::Null(anchor) => match anchor {
                Some(a) => write!(formatter, "Null(&{})", a),
                None => formatter.write_str("Null"),
            },
            Value::Bool(boolean, anchor) => match anchor {
                Some(a) => write!(formatter, "Bool({}, &{})", boolean, a),
                None => write!(formatter, "Bool({})", boolean),
            },
            Value::Number(number, anchor) => match anchor {
                Some(a) => write!(formatter, "Number({}, &{})", number, a),
                None => write!(formatter, "Number({})", number),
            },
            Value::String(string, anchor) => match anchor {
                Some(a) => write!(formatter, "String({:?}, &{})", string, a),
                None => write!(formatter, "String({:?})", string),
            },
            Value::Sequence(sequence) => {
                // Print optional anchor if present, then the list contents.
                match &sequence.anchor {
                    Some(a) => write!(formatter, "Sequence(&{}) ", a)?,
                    None => formatter.write_str("Sequence ")?,
                }
                formatter.debug_list().entries(sequence).finish()
            }
            Value::Mapping(mapping) => Debug::fmt(mapping, formatter),
            Value::Alias(name) => write!(formatter, "Alias(*{})", name),
            Value::Tagged(tagged) => Debug::fmt(tagged, formatter),
        }
    }
}

struct DisplayNumber<'a>(&'a Number);

impl Debug for DisplayNumber<'_> {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        Display::fmt(self.0, formatter)
    }
}

impl Debug for Number {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        write!(formatter, "Number({})", self)
    }
}

impl Debug for Mapping {
    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
        match &self.anchor {
            Some(a) => write!(formatter, "Mapping(&{}) ", a)?,
            None => formatter.write_str("Mapping ")?,
        }
        let mut debug = formatter.debug_map();
        for (k, v) in self {
            let tmp;
            debug.entry(
                match k {
                    Value::Bool(boolean, _) => boolean,
                    Value::Number(number, _) => {
                        tmp = DisplayNumber(number);
                        &tmp
                    }
                    Value::String(string, _) => string,
                    _ => k,
                },
                v,
            );
        }
        debug.finish()
    }
}