diff --git a/src/parser.rs b/src/parser.rs
index a81bb04..470d16a 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -102,7 +102,7 @@ impl ConfigField {
                 impl #ident {
                     pub fn new(value: #ty) -> Option<Self> {
                         if (#min..=#max).contains(&value) {
-                            Self(value)
+                            Some(Self(value))
                         } else {
                             None
                         }
@@ -165,7 +165,7 @@ impl ConfigField {
         let conversion = if self.has_custom_limits() {
             quote! {
                 Self::new(value).ok_or_else(|| {
-                    <D:Error as ::serde::de::Error>::custom("checking value bounds")
+                    <D::Error as ::serde::de::Error>::custom("checking value bounds")
                 })
             }
         } else {
@@ -213,8 +213,8 @@ impl ConfigField {
                     (stringify!($field),
                     value.clone().explicit().map(|val| {
                         parse_quote!({
-                            let val: #ty = #val;
-                            val
+                            fn type_ascribe(val: #ty) -> #ty {val}
+                            type_ascribe(#val)
                         })
                     }).unwrap_or_else(|| {
                         parse_quote!(#ty::$default)
@@ -290,7 +290,7 @@ impl ConfigField {
             .enumerate()
             .map(|(i, (_, expr))| {
                 quote! {
-                    #i => #expr.serialize(ser).map_err(|err| ::miniconf::Error::Inner(0, err)),
+                    #i => ::serde::Serialize::serialize(&#expr, ser).map_err(|err| ::miniconf::Error::Inner(0, err)),
                 }
             })
             .collect::<Vec<_>>();
@@ -307,7 +307,7 @@ impl ConfigField {
                     S: ::serde::Serializer,
                 {
                     let ::core::result::Result::Ok(key) = keys.next::<Self>() else {
-                        return self.serialize(ser).map_err(|err| ::miniconf::Error::Inner(1, err)).map(|_| 1);
+                        return ::serde::Serialize::serialize(&self, ser).map_err(|err| ::miniconf::Error::Inner(1, err)).map(|_| 1);
                     };
                     let index = ::miniconf::Key::find::<Self>(&key).ok_or(::miniconf::Traversal::NotFound(1))?;
                     if !keys.finalize() {
@@ -338,7 +338,7 @@ impl ConfigField {
                     D: ::serde::Deserializer<'de>,
                 {
                     let ::core::result::Result::Ok(key) = keys.next::<Self>() else {
-                        *self = Self::deserialize(de).map_err(|err| ::miniconf::Error::Inner(0, err))?;
+                        *self = <Self as ::serde::Deserialize>::deserialize(de).map_err(|err| ::miniconf::Error::Inner(0, err))?;
                         return ::core::result::Result::Ok(0);
                     };
                     let index = ::miniconf::Key::find::<Self>(&key).ok_or(::miniconf::Traversal::NotFound(1))?;
@@ -347,7 +347,7 @@ impl ConfigField {
                     }
                     match index {
                         0 => {
-                            *self = Self::deserialize(de).map_err(|err| ::miniconf::Error::Inner(0, err))?;
+                            *self = <Self as ::serde::Deserialize>::deserialize(de).map_err(|err| ::miniconf::Error::Inner(0, err))?;
                             Ok(0)
                         }
                         ,