When receiving ZADD with INCR modifier, convert result to double.

glide-core/src/client/value_conversion.rs

@@ -59,6 +59,14 @@ pub(crate) fn convert_to_expected_type(
 }
 
 pub(crate) fn expected_type_for_cmd(cmd: &Cmd) -> Option<ExpectedReturnType> {
+    if cmd.arg_idx(0) == Some(b"ZADD") {
+        return if cmd.position(b"INCR").is_some() {
+            Some(ExpectedReturnType::Double)
+        } else {
+            None
+        };
+    }
+
     let command = cmd.command()?;
 
     match command.as_slice() {
@@ -73,3 +81,28 @@ pub(crate) fn expected_type_for_cmd(cmd: &Cmd) -> Option<ExpectedReturnType> {
         _ => None,
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn convert_zadd_only_if_incr_is_included() {
+        assert!(matches!(
+            expected_type_for_cmd(
+                redis::cmd("ZADD")
+                    .arg("XT")
+                    .arg("CH")
+                    .arg("INCR")
+                    .arg("0.6")
+                    .arg("foo")
+            ),
+            Some(ExpectedReturnType::Double)
+        ));
+
+        assert!(expected_type_for_cmd(
+            redis::cmd("ZADD").arg("XT").arg("CH").arg("0.6").arg("foo")
+        )
+        .is_none());
+    }
+}