use std::path::PathBuf;use serde::Deserialize;use serde::Deserializer;use serde::Serialize;use serde::Serializer;pub fn deserialize_empty_path_as_none<'de, D>(deserializer: D) -> Result<Option<PathBuf>, D::Error>where    D: Deserializer<'de>,{    let path = Option::<PathBuf>::deserialize(deserializer)?;    Ok(path.filter(|path| !path.as_os_str().is_empty()))}pub fn deserialize_double_option<'de, T, D>(deserializer: D) -> Result<Option<Option<T>>, D::Error>where    T: Deserialize<'de>,    D: Deserializer<'de>,{    serde_with::rust::double_option::deserialize(deserializer)}pub fn serialize_double_option<T, S>(    value: &Option<Option<T>>,    serializer: S,) -> Result<S::Ok, S::Error>where    T: Serialize,    S: Serializer,{    serde_with::rust::double_option::serialize(value, serializer)}