Function to_canonical_value 

pub fn to_canonical_value<T>(
    value: T,
) -> Result<CanonicalJsonValue, CanonicalJsonError>
where
    T: Serialize,

Fallible conversion from any value that implements Serialize to a CanonicalJsonValue.

This behaves similarly to serde_json::to_value(), except for the following restrictions which return errors:

• Integers must be in the range accepted by js_int::Int.
• Floats and bytes are not serializable.
• Booleans and integers cannot be used as keys for an object. serde_json accepts those types as keys by serializing them as strings.
• The same key cannot be serialized twice in an object. serde_json uses the last value that is serialized for the same key.