Add support for 'nan' #921
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This PR allows the usage of 'nan' in json, like
json!(nan)
.With that.. null could be used as +/-infinity, and that can help people that uses serde serialization for more complex data types and protocol standards.
To explain a bit better my use case, I'm using serde with json to create a REST API based the mavlink protocol standard, but some messages uses
nan
to define some specific behavior for some sensors.PS: since this needs
std::f64::NAN
to use it, should I move it as a feature ?Helps #202