#[serde(flatten)] with nested struct fails to deserialize numeric query parameters

I have the following structs: ``` #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct PaginationQuery { #[serde(default = "default_current")] pub current: u16, #[serde(default = "default_page_size")] pub page_size: u8, #[serde(flatten)] pub extra: HashMap<String, String>, } #[derive(Debug, Clone, Serialize, Deserialize)] #[serde(rename_all = "camelCase")] pub struct ProjectPaginationQuery { #[serde(flatten)] pub project_info: ProjectInfo, // another struct #[serde(flatten)] pub pagination: PaginationQuery, } ``` When I query the endpoint: `http://localhost:5173/api/node/get_data_list?current=1&pageSize=20&projectName=test&tableName=test` PaginationQuery works perfectly and correctly deserializes the parameters. However, when I try to use ProjectPaginationQuery, I get the following error: `Query deserialize error: invalid type: string "1", expected u16` It seems that when flattening into a nested struct, numeric query parameters are interpreted as strings instead of the expected numeric type. **Environment:** [dependencies] ntex = { version = "3", features = ["tokio","cookie"] } tokio = { version = "1", features = ["full"] } serde = { version = "1", features = ["derive"] } serde_json = "1"