add unspecified precision comment for to_degrees and to_radians

Author: karolzwolak

library/core/src/num/f128.rs

@@ -630,6 +630,13 @@ impl f128 {
 
     /// Converts radians to degrees.
     ///
+    /// # Unspecified precision
+    ///
+    /// The precision of this function is non-deterministic. This means it varies by platform, Rust version, and
+    /// can even differ within the same execution from one invocation to the next.
+    ///
+    /// # Examples
+    ///
     /// ```
     /// #![feature(f128)]
     /// # // FIXME(f16_f128): remove when `eqtf2` is available
@@ -654,6 +661,13 @@ impl f128 {
 
     /// Converts degrees to radians.
     ///
+    /// # Unspecified precision
+    ///
+    /// The precision of this function is non-deterministic. This means it varies by platform, Rust version, and
+    /// can even differ within the same execution from one invocation to the next.
+    ///
+    /// # Examples
+    ///
     /// ```
     /// #![feature(f128)]
     /// # // FIXME(f16_f128): remove when `eqtf2` is available

library/core/src/num/f16.rs

@@ -625,6 +625,13 @@ impl f16 {
 
     /// Converts radians to degrees.
     ///
+    /// # Unspecified precision
+    ///
+    /// The precision of this function is non-deterministic. This means it varies by platform, Rust version, and
+    /// can even differ within the same execution from one invocation to the next.
+    ///
+    /// # Examples
+    ///
     /// ```
     /// #![feature(f16)]
     /// # // FIXME(f16_f128): extendhfsf2, truncsfhf2, __gnu_h2f_ieee, __gnu_f2h_ieee missing for many platforms
@@ -647,6 +654,13 @@ impl f16 {
 
     /// Converts degrees to radians.
     ///
+    /// # Unspecified precision
+    ///
+    /// The precision of this function is non-deterministic. This means it varies by platform, Rust version, and
+    /// can even differ within the same execution from one invocation to the next.
+    ///
+    /// # Examples
+    ///
     /// ```
     /// #![feature(f16)]
     /// # // FIXME(f16_f128): extendhfsf2, truncsfhf2, __gnu_h2f_ieee, __gnu_f2h_ieee missing for many platforms

library/core/src/num/f32.rs

@@ -839,6 +839,13 @@ impl f32 {
 
     /// Converts radians to degrees.
     ///
+    /// # Unspecified precision
+    ///
+    /// The precision of this function is non-deterministic. This means it varies by platform, Rust version, and
+    /// can even differ within the same execution from one invocation to the next.
+    ///
+    /// # Examples
+    ///
     /// ```
     /// let angle = std::f32::consts::PI;
     ///
@@ -859,6 +866,13 @@ impl f32 {
 
     /// Converts degrees to radians.
     ///
+    /// # Unspecified precision
+    ///
+    /// The precision of this function is non-deterministic. This means it varies by platform, Rust version, and
+    /// can even differ within the same execution from one invocation to the next.
+    ///
+    /// # Examples
+    ///
     /// ```
     /// let angle = 180.0f32;
     ///

library/core/src/num/f64.rs

@@ -856,6 +856,13 @@ impl f64 {
 
     /// Converts radians to degrees.
     ///
+    /// # Unspecified precision
+    ///
+    /// The precision of this function is non-deterministic. This means it varies by platform, Rust version, and
+    /// can even differ within the same execution from one invocation to the next.
+    ///
+    /// # Examples
+    ///
     /// ```
     /// let angle = std::f64::consts::PI;
     ///
@@ -878,6 +885,13 @@ impl f64 {
 
     /// Converts degrees to radians.
     ///
+    /// # Unspecified precision
+    ///
+    /// The precision of this function is non-deterministic. This means it varies by platform, Rust version, and
+    /// can even differ within the same execution from one invocation to the next.
+    ///
+    /// # Examples
+    ///
     /// ```
     /// let angle = 180.0_f64;
     ///