diff --git a/src/lib.rs b/src/lib.rs
index 2f9864b0..91dfebf4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -431,8 +431,8 @@ pub trait Conversion<V> {
     /// converting the given unit. To convert to the base unit for the quantity use `(value +
     /// constant()) * coefficient()`. To convert from the base unit, `(value / coefficient()) -
     /// constant()` is used. Implementation should return the additive identity (`Self::T::zero()`)
-    /// if no constant exists. See [ConstantOp](enum.ConstantOp.html) documentation for details
-    /// about parameter use to ensure the method optimizes correctly.
+    /// if no constant exists. See [`ConstantOp`] documentation for details about parameter use to
+    /// ensure the method optimizes correctly.
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[inline(always)]
     #[allow(unused_variables)]
@@ -515,8 +515,8 @@ pub trait Kind:
 storage_types! {
     types: Float;
 
-    impl crate::Conversion<V> for V {
-        type T = V;
+    impl crate::Conversion<Self> for V {
+        type T = Self;
 
         #[inline(always)]
         fn constant(op: crate::ConstantOp) -> Self::T {
@@ -532,14 +532,14 @@ storage_types! {
         }
     }
 
-    impl crate::ConversionFactor<V> for V {
+    impl crate::ConversionFactor<Self> for V {
         #[inline(always)]
         fn powi(self, e: i32) -> Self {
-            <V as crate::num::Float>::powi(self, e)
+            <Self as crate::num::Float>::powi(self, e)
         }
 
         #[inline(always)]
-        fn value(self) -> V {
+        fn value(self) -> Self {
             self
         }
     }
@@ -738,7 +738,7 @@ pub mod str {
 
     impl Display for ParseQuantityError {
         fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
-            use ParseQuantityError::*;
+            use ParseQuantityError::{NoSeparator, UnknownUnit, ValueParseError};
 
             match *self {
                 NoSeparator => write!(f, "no space between quantity and units"),
diff --git a/src/quantity.rs b/src/quantity.rs
index 4e1bccb4..a58d332a 100644
--- a/src/quantity.rs
+++ b/src/quantity.rs
@@ -1,6 +1,6 @@
 /// Macro to implement a [quantity][quantity] and associated [measurement units][measurement]. Note
-/// that this macro must be executed in direct submodules of the module where the
-/// [`system!`](macro.system.html) macro was executed. `@...` match arms are considered private.
+/// that this macro must be executed in direct submodules of the module where the [`system!`] macro
+/// was executed. `@...` match arms are considered private.
 ///
 /// * `$quantity_attr`: Quantity attributes. Generally used to set documentation comments for the
 ///   quantity.
@@ -13,7 +13,7 @@
 ///   represented as a `typenum` type-level integer (e.g. `N1`, `Z0`, `P1`, `P2`, ...).
 /// * `$kind`: [Kind][kind] of the quantity. Optional. This variable should only be specified when
 ///   defining a quantity that has the same dimensions as another quantity but isn't comparable.
-///   When not specified [`uom::Kind`](trait.Kind.html) is used.
+///   When not specified [`crate::Kind`] is used.
 /// * `$unit`: Unit name (e.g. `meter`, `foot`).
 /// * `$conversion`: Conversion (coefficient and constant factor) from the unit to the base unit of
 ///   the quantity (e.g. `3.048_E-1` to convert `foot` to `meter`. `1.0_E0, 273.15_E0` to convert
@@ -125,7 +125,7 @@ macro_rules! quantity {
         pub trait Unit: __system::Unit {}
 
         /// Trait to identify [units][units] which have a [conversion factor][factor] for the
-        /// `Quantity`. See [`Conversion<V>`](../../trait.Conversion.html).
+        /// `Quantity`. See [`crate::Conversion<V>`].
         ///
         /// ## Generic Parameters
         /// * `V`: Underlying storage type trait is implemented for.
@@ -147,7 +147,7 @@ macro_rules! quantity {
         #[must_use = "method returns a static value"]
         #[allow(dead_code)]
         #[inline(always)]
-        pub fn description() -> &'static str {
+        pub const fn description() -> &'static str {
             $description
         }
 
@@ -337,7 +337,7 @@ macro_rules! quantity {
             /// * `N`: Unit.
             #[must_use = "method returns a new object"]
             pub fn format_args<N>(
-                unit: N,
+                _unit: N,
                 style: $crate::fmt::DisplayStyle
             ) -> __system::fmt::Arguments<Dimension, N>
             where
@@ -345,7 +345,7 @@ macro_rules! quantity {
             {
                 __system::fmt::Arguments {
                     dimension: $crate::lib::marker::PhantomData,
-                    unit,
+                    unit: $crate::lib::marker::PhantomData,
                     style,
                 }
             }
@@ -378,7 +378,7 @@ macro_rules! quantity {
             #[must_use = "method returns a new object and does not mutate the original one"]
             pub fn into_format_args<N>(
                 self,
-                unit: N,
+                _unit: N,
                 style: $crate::fmt::DisplayStyle
             ) -> __system::fmt::QuantityArguments<Dimension, U, V, N>
             where
@@ -387,7 +387,7 @@ macro_rules! quantity {
                 __system::fmt::QuantityArguments {
                     arguments: __system::fmt::Arguments {
                         dimension: $crate::lib::marker::PhantomData,
-                        unit,
+                        unit: $crate::lib::marker::PhantomData,
                         style,
                     },
                     quantity: self,
diff --git a/src/si/electric_permittivity.rs b/src/si/electric_permittivity.rs
index 69d0f9c5..c417c616 100644
--- a/src/si/electric_permittivity.rs
+++ b/src/si/electric_permittivity.rs
@@ -15,7 +15,7 @@ quantity! {
         Z0>;    // luminous intensity
     units {
         @farad_per_meter: prefix!(none); "F/m", "farad per meter", "farads per meter";
-        @vacuum_electric_permittivity: 8.854_187_8128_E-12; "ε₀", "vacuum electric permittivity",
+        @vacuum_electric_permittivity: 8.854_187_812_8_E-12; "ε₀", "vacuum electric permittivity",
             "vacuum electric permittivity";
     }
 }
diff --git a/src/si/magnetic_moment.rs b/src/si/magnetic_moment.rs
index bb5b7102..dcc6362c 100644
--- a/src/si/magnetic_moment.rs
+++ b/src/si/magnetic_moment.rs
@@ -25,8 +25,8 @@ quantity! {
             "statA · cm²", "statampere square centimeter", "statampere square centimeters";
         @erg_per_gauss:  1.0_E-7 / 1.0_E-4; "erg/G", "erg per gauss", "ergs per gauss";
 
-        @bohr_magneton: 9.274_010_0783_E-24; "µ(Bohr)", "Bohr magneton", "Bohr magnetons";
-        @nuclear_magneton: 5.050_783_7461_E-27; "μ(Nuclear)", "nuclear magneton",
+        @bohr_magneton: 9.274_010_078_3_E-24; "µ(Bohr)", "Bohr magneton", "Bohr magnetons";
+        @nuclear_magneton: 5.050_783_746_1_E-27; "μ(Nuclear)", "nuclear magneton",
             "nuclear magnetons";
         @atomic_unit_of_magnetic_dipole_moment: 1.854_802_015_66_E-23; "ħ · e/mₑ",
             "atomic unit of magnetic dipole moment", " atomic units of magnetic dipole moment";
diff --git a/src/si/mass_rate.rs b/src/si/mass_rate.rs
index 55b1a600..8e440c19 100644
--- a/src/si/mass_rate.rs
+++ b/src/si/mass_rate.rs
@@ -100,7 +100,7 @@ quantity! {
         /// Ton per minute, metric.
         @ton_per_minute: 1.666_666_666_666_666_6_E1; "t/min", "ton per minute", "tons per minute";
         /// Ton per hour, metric.
-        @ton_per_hour: 2.777777777777778_E-1; "t/h", "ton per hour", "tons per hour";
+        @ton_per_hour: 2.777_777_777_777_778_E-1; "t/h", "ton per hour", "tons per hour";
         /// Ton per day, metric.
         @ton_per_day: 1.157_407_407_407_407_4_E-2; "t/d", "ton per day", "tons per day";
     }
diff --git a/src/si/ratio.rs b/src/si/ratio.rs
index bd789871..9ea65371 100644
--- a/src/si/ratio.rs
+++ b/src/si/ratio.rs
@@ -86,21 +86,21 @@ where
     /// Returns `e^(self)`, (the exponential function).
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[inline(always)]
-    pub fn exp(self) -> Ratio<U, V> {
+    pub fn exp(self) -> Self {
         Ratio::new::<ratio>(self.value.exp())
     }
 
     /// Returns 2^(self).
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[inline(always)]
-    pub fn exp2(self) -> Ratio<U, V> {
+    pub fn exp2(self) -> Self {
         Ratio::new::<ratio>(self.value.exp2())
     }
 
     /// Returns the natural logarithm of the number.
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[inline(always)]
-    pub fn ln(self) -> Ratio<U, V> {
+    pub fn ln(self) -> Self {
         Ratio::new::<ratio>(self.value.ln())
     }
 
@@ -111,28 +111,28 @@ where
     /// self.log10() can produce more accurate results for base 10.
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[inline(always)]
-    pub fn log(self, base: V) -> Ratio<U, V> {
+    pub fn log(self, base: V) -> Self {
         Ratio::new::<ratio>(self.value.log(base))
     }
 
     /// Returns the base 2 logarithm of the number.
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[inline(always)]
-    pub fn log2(self) -> Ratio<U, V> {
+    pub fn log2(self) -> Self {
         Ratio::new::<ratio>(self.value.log2())
     }
 
     /// Returns the base 10 logarithm of the number.
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[inline(always)]
-    pub fn log10(self) -> Ratio<U, V> {
+    pub fn log10(self) -> Self {
         Ratio::new::<ratio>(self.value.log10())
     }
 
     /// Returns e^(self) - 1 in a way that is accurate even if the number is close to zero.
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[inline(always)]
-    pub fn exp_m1(self) -> Ratio<U, V> {
+    pub fn exp_m1(self) -> Self {
         Ratio::new::<ratio>(self.value.exp_m1())
     }
 
@@ -140,13 +140,13 @@ where
     /// operations were performed separately.
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[inline(always)]
-    pub fn ln_1p(self) -> Ratio<U, V> {
+    pub fn ln_1p(self) -> Self {
         Ratio::new::<ratio>(self.value.ln_1p())
     }
 }
 
 mod convert {
-    use super::*;
+    use super::Ratio;
 
     impl<U, V> From<V> for Ratio<U, V>
     where
@@ -163,14 +163,14 @@ mod convert {
     }
 
     storage_types! {
-        use super::*;
+        use super::Ratio;
 
-        impl<U> From<Ratio<U, V>> for V
+        impl<U> From<Ratio<U, Self>> for V
         where
-            U: crate::si::Units<V> + ?Sized,
-            V: crate::num::Num + crate::Conversion<V>,
+            U: crate::si::Units<Self> + ?Sized,
+            Self: crate::num::Num + crate::Conversion<Self>,
         {
-            fn from(t: Ratio<U, V>) -> Self {
+            fn from(t: Ratio<U, Self>) -> Self {
                 t.value
             }
         }
diff --git a/src/si/time.rs b/src/si/time.rs
index 5f03de91..a5c8124f 100644
--- a/src/si/time.rs
+++ b/src/si/time.rs
@@ -96,7 +96,7 @@ where
         let nanos = (time % Time::<U, V>::new::<second>(V::one())).get::<nanosecond>().to_u32();
 
         match (secs, nanos) {
-            (Some(secs), Some(nanos)) => Ok(Duration::new(secs, nanos)),
+            (Some(secs), Some(nanos)) => Ok(Self::new(secs, nanos)),
             _ => Err(TryFromError::Overflow),
         }
     }
diff --git a/src/system.rs b/src/system.rs
index d73ff3c1..2a0e0c2a 100644
--- a/src/system.rs
+++ b/src/system.rs
@@ -1423,10 +1423,10 @@ macro_rules! system {
             pub struct Arguments<D, N>
             where
                 D: Dimension + ?Sized,
-                N: Unit,
+                N: Unit + ?Sized,
             {
                 pub(super) dimension: $crate::lib::marker::PhantomData<D>,
-                pub(super) unit: N,
+                pub(super) unit: $crate::lib::marker::PhantomData<N>,
                 pub(super) style: DisplayStyle,
             }
 
@@ -1466,11 +1466,7 @@ macro_rules! system {
                 N: Unit,
             {
                 fn clone(&self) -> Self {
-                    Self {
-                        dimension: $crate::lib::marker::PhantomData,
-                        unit: self.unit.clone(),
-                        style: self.style.clone(),
-                    }
+                    *self
                 }
             }
 
diff --git a/src/unit.rs b/src/unit.rs
index cf86fc7b..b6251243 100644
--- a/src/unit.rs
+++ b/src/unit.rs
@@ -283,8 +283,8 @@ macro_rules! unit {
         #[derive(Clone, Copy, Debug, Hash)]
         pub struct $unit;
     };
-    (@coefficient $factor:expr, $const:expr) => { $factor };
-    (@coefficient $factor:expr) => { $factor };
+    (@coefficient $factor:expr, $const:expr) => { #[allow(clippy::eq_op)] {$factor} };
+    (@coefficient $factor:expr) => { #[allow(clippy::eq_op)] {$factor} };
     (@constant $op:ident $factor:expr, $const:expr) => { $const };
     (@constant $op:ident $factor:expr) => {
         match $op {