src/json.rs


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use serde::{de, Deserialize, Deserializer};
use serde_json::Value;

/// Match a valid number from a string value to a `f64` value
pub fn number_from_string<'de, D: Deserializer<'de>>(deserializer: D) -> Result<f64, D::Error> {
    Ok(match Value::deserialize(deserializer)? {
        Value::String(s) => s.parse().map_err(de::Error::custom)?,
        Value::Number(num) => num
            .as_f64()
            .ok_or_else(|| de::Error::custom("Invalid number"))?,
        _ => return Err(de::Error::custom("wrong type")),
    })
}