1 files changed, 10 insertions, 0 deletions
diff --git a/src/json.rs b/src/json.rs
new file mode 100644
index 0000000..9515661
--- /dev/null
+++ b/src/json.rs
@@ -0,0 +1,10 @@
+use serde::{de, Deserialize, Deserializer};
+use serde_json::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(de::Error::custom("Invalid number"))?,
+        _ => return Err(de::Error::custom("wrong type")),
+    })
+}