Implement Settings for Saturating<T> and NonZero<T>

In both cases, we need to add impls for specific instantiations because
serde does not supply `Serialize`/`Deserialize` impls for the generic
versions. (Those were added later to std.) Serde needs to be at least
version `1.0.198`.

Additionally, for `NonZero`, our impl only applies to
`Option<NonZero<T>>` because `NonZero<T>` does not have a sensible
default value.

Resolves #161

Author: TheJokr

Cargo.toml

@@ -73,7 +73,7 @@ regex = "1.8"
 reqwest = { version = "0.12", default-features = false }
 socket2 = { version = "0.5", features = ["all"] }
 syn = "2"
-serde = "1"
+serde = "1.0.198"
 serde_path_to_error = "0.1.17"
 serde_yaml = "0.8.26"
 serde_with = "3.3"

foundations/src/settings/basic_impls.rs

@@ -8,7 +8,7 @@ use std::ffi::{CString, OsString};
 use std::fmt::Debug;
 use std::hash::Hash;
 use std::marker::PhantomData;
-use std::num::Wrapping;
+use std::num::{NonZero, Saturating, Wrapping};
 use std::ops::Range;
 use std::path::PathBuf;
 use std::rc::Rc;
@@ -34,6 +34,20 @@ impl_noop!(<Idx> Settings for Range<Idx> where Idx: Debug + Serialize + Deserial
 impl_noop!(<T> Settings for Reverse<T> where T: Settings);
 impl_noop!(<T> Settings for Wrapping<T> where T: Settings);
 
+// serde does not have generic impls for Saturating<T> and NonZero<T>
+macro_rules! impl_for_num {
+    ( $( $Ty:ty )* ) => { $(
+        impl_noop!(Settings for $Ty);
+        impl_noop!(Settings for Saturating<$Ty>);
+        impl_noop!(Settings for Option<NonZero<$Ty>>);
+    )* };
+}
+
+impl_for_num! {
+    i8 i16 i32 i64 i128 isize
+    u8 u16 u32 u64 u128 usize
+}
+
 macro_rules! impl_for_non_generic {
     ( $( $Ty:ty ),* ) => {
         $( impl_noop!(Settings for $Ty); )*
@@ -45,18 +59,6 @@ impl_for_non_generic! {
     char,
     f32,
     f64,
-    i128,
-    i16,
-    i32,
-    i64,
-    i8,
-    isize,
-    u128,
-    u16,
-    u32,
-    u64,
-    u8,
-    usize,
     String,
     (),
     CString,