diff --git a/Cargo.toml b/Cargo.toml
index 312eb6ebd..e0b8092c0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -43,7 +43,7 @@ resolver = "2"
 # When changing any of these values, be sure to also update the non-workspace packages
 # as listed above, if applicable.
 edition = "2021"
-rust-version = "1.81"
+rust-version = "1.82"
 license = "MIT OR Apache-2.0"
 authors = ["Kevin Reid <kpreid@switchb.org>"]
 # TODO: add homepage = "..." when we have one
diff --git a/all-is-cubes-base/src/math/color.rs b/all-is-cubes-base/src/math/color.rs
index 816ede090..e96e5982f 100644
--- a/all-is-cubes-base/src/math/color.rs
+++ b/all-is-cubes-base/src/math/color.rs
@@ -107,8 +107,22 @@ impl Rgb {
     /// No other range checks are performed.
     #[inline]
     #[track_caller]
-    pub fn new(r: f32, g: f32, b: f32) -> Self {
-        Self::try_from(vec3(r, g, b)).expect("Color components may not be NaN")
+    pub const fn new(r: f32, g: f32, b: f32) -> Self {
+        match Self::try_new(vec3(r, g, b)) {
+            Ok(color) => color,
+            Err(_) => panic!("color components may not be NaN"),
+        }
+    }
+
+    const fn try_new(value: Vector3D<f32, Intensity>) -> Result<Self, FloatIsNan> {
+        match (
+            new_nn_f32(value.x),
+            new_nn_f32(value.y),
+            new_nn_f32(value.z),
+        ) {
+            (Ok(r), Ok(g), Ok(b)) => Ok(Self(vec3(r, g, b))),
+            (Err(e), _, _) | (_, Err(e), _) | (_, _, Err(e)) => Err(e),
+        }
     }
 
     /// Constructs a color from components that have already been checked for not being
@@ -124,7 +138,8 @@ impl Rgb {
     /// Constructs a shade of gray (components all equal). Panics if any component is NaN.
     /// No other range checks are performed.
     #[inline]
-    pub fn from_luminance(luminance: f32) -> Self {
+    #[track_caller]
+    pub const fn from_luminance(luminance: f32) -> Self {
         Self::new(luminance, luminance, luminance)
     }
 
@@ -224,8 +239,11 @@ impl Rgba {
     /// No other range checks are performed.
     #[inline]
     #[track_caller]
-    pub fn new(r: f32, g: f32, b: f32, a: f32) -> Self {
-        Rgb::new(r, g, b).with_alpha(NotNan::new(a).expect("Alpha may not be NaN"))
+    pub const fn new(r: f32, g: f32, b: f32, a: f32) -> Self {
+        match new_nn_f32(a) {
+            Ok(a) => Rgb::new(r, g, b).with_alpha(a),
+            Err(_) => panic!("alpha may not be NaN"),
+        }
     }
 
     /// Constructs a color from components that have already been checked for not being
@@ -244,7 +262,8 @@ impl Rgba {
     /// Constructs a shade of gray (components all equal). Panics if any component is NaN.
     /// No other range checks are performed.
     #[inline]
-    pub fn from_luminance(luminance: f32) -> Self {
+    #[track_caller]
+    pub const fn from_luminance(luminance: f32) -> Self {
         Rgb::new(luminance, luminance, luminance).with_alpha_one()
     }
 
@@ -784,6 +803,19 @@ const CONST_LINEAR_LOOKUP_TABLE: &[f32; 256] = &[
     0.9882353, 0.99215686, 0.99607843, 1.0,
 ];
 
+// Const replacement for `NotNan::new()`
+const fn new_nn_f32(value: f32) -> Result<NotNan<f32>, FloatIsNan> {
+    #![allow(clippy::eq_op)]
+    // This condition is true if and only if the value is NaN
+    // TODO: Replace this with `.is_nan()` after Rust 1.83 is released with `const_float_classify`.
+    if value != value {
+        Err(FloatIsNan)
+    } else {
+        // SAFETY: We just checked the only safety condition.
+        Ok(unsafe { NotNan::new_unchecked(value) })
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/all-is-cubes-base/src/raycast/tests.rs b/all-is-cubes-base/src/raycast/tests.rs
index c0a194cfc..51d66a593 100644
--- a/all-is-cubes-base/src/raycast/tests.rs
+++ b/all-is-cubes-base/src/raycast/tests.rs
@@ -27,8 +27,7 @@ impl TestStep {
     fn matches(self, step: &RaycastStep) -> bool {
         self.cube == step.cube_ahead()
             && self.face == step.face()
-            && self.t_distance.map_or(true, |td| step.t_distance() == td)
-            && self.t_distance.map_or(true, |td| step.t_distance() == td)
+            && self.t_distance.is_none_or(|td| step.t_distance() == td)
     }
 }
 
diff --git a/all-is-cubes-desktop/src/glue/rerun_mesh.rs b/all-is-cubes-desktop/src/glue/rerun_mesh.rs
index 5b4f952d1..ac664c24f 100644
--- a/all-is-cubes-desktop/src/glue/rerun_mesh.rs
+++ b/all-is-cubes-desktop/src/glue/rerun_mesh.rs
@@ -48,8 +48,6 @@ impl From<mesh::BlockVertex<NoTexture>> for Vertex {
             position: v.position.to_f32().to_array().into(),
             color: match v.coloring {
                 mesh::Coloring::Solid(color) => color.to_srgb8().into(),
-                #[allow(unreachable_patterns)] // TODO: Remove this arm after Rust 1.82
-                mesh::Coloring::Texture { .. } => unreachable!(),
             },
         }
     }
diff --git a/all-is-cubes-mesh/src/block_mesh/viz.rs b/all-is-cubes-mesh/src/block_mesh/viz.rs
index ea02d75bc..1a2065573 100644
--- a/all-is-cubes-mesh/src/block_mesh/viz.rs
+++ b/all-is-cubes-mesh/src/block_mesh/viz.rs
@@ -213,15 +213,14 @@ impl Viz {
             state
                 .mesh_vertex_positions
                 .extend(vertex_positions.iter().copied());
-            state.mesh_vertex_colors.extend(
-                iter::repeat(rg::components::Color(color_fn().into())).take(vertex_positions.len()),
-            );
-            state.mesh_vertex_normals.extend(
-                iter::repeat(rg::components::Vector3D(rg::convert_vec(
-                    normal.normal_vector::<f32, ()>(),
-                )))
-                .take(vertex_positions.len()),
-            );
+            state.mesh_vertex_colors.extend(iter::repeat_n(
+                rg::components::Color(color_fn().into()),
+                vertex_positions.len(),
+            ));
+            state.mesh_vertex_normals.extend(iter::repeat_n(
+                rg::components::Vector3D(rg::convert_vec(normal.normal_vector::<f32, ()>())),
+                vertex_positions.len(),
+            ));
             state.mesh_triangle_indices.extend(
                 relative_indices_iter
                     .clone()
diff --git a/all-is-cubes-mesh/src/space_mesh.rs b/all-is-cubes-mesh/src/space_mesh.rs
index 5cbb2abc1..d618e13ad 100644
--- a/all-is-cubes-mesh/src/space_mesh.rs
+++ b/all-is-cubes-mesh/src/space_mesh.rs
@@ -258,7 +258,7 @@ impl<M: MeshTypes> SpaceMesh<M> {
                     if let Some(adj_block_index) = space_data_source(adjacent_cube) {
                         if block_meshes
                             .get_block_mesh(adj_block_index, adjacent_cube, false)
-                            .map_or(false, |bm| bm.face_vertices[face.opposite()].fully_opaque)
+                            .is_some_and(|bm| bm.face_vertices[face.opposite()].fully_opaque)
                         {
                             // Don't draw obscured faces, but do record that we depended on them.
                             bitset_set_and_get(
diff --git a/all-is-cubes-port/src/gltf.rs b/all-is-cubes-port/src/gltf.rs
index 43bb50436..8f359b5e3 100644
--- a/all-is-cubes-port/src/gltf.rs
+++ b/all-is-cubes-port/src/gltf.rs
@@ -251,7 +251,7 @@ impl GltfWriter {
             for (frame_number, state) in self.frame_states.iter().enumerate() {
                 for &instance in &state.visible_mesh_instances {
                     let timeline = timelines.entry(instance).or_default();
-                    if !timeline.last().map_or(true, |&(_, vis)| vis) {
+                    if !timeline.last().is_none_or(|&(_, vis)| vis) {
                         // Node needs to be made visible.
                         timeline.push((frame_number, true));
                     }
@@ -267,7 +267,7 @@ impl GltfWriter {
                     match timelines.entry(instance) {
                         Entry::Occupied(mut e) => {
                             let timeline = e.get_mut();
-                            if timeline.last().map_or(true, |&(_, vis)| vis) {
+                            if timeline.last().is_none_or(|&(_, vis)| vis) {
                                 // Node needs to be made invisible.
                                 timeline.push((frame_number, false));
                             }
diff --git a/all-is-cubes-ui/src/ui_content/pages.rs b/all-is-cubes-ui/src/ui_content/pages.rs
index b1984bb34..c88a39f68 100644
--- a/all-is-cubes-ui/src/ui_content/pages.rs
+++ b/all-is-cubes-ui/src/ui_content/pages.rs
@@ -53,8 +53,6 @@ pub(super) fn new_paused_page(
             // TODO: quit_fn should be an async function, but we don't have a way to
             // kick off a “Quitting...” task yet.
             move || match quit_fn() {
-                #[allow(unreachable_patterns, reason = "TODO: Remove this arm after Rust 1.82")]
-                Ok(s) => match s {},
                 Err(_cancelled) => {
 
                     // TODO: display message indicating failure
diff --git a/all-is-cubes-wasm/Cargo.toml b/all-is-cubes-wasm/Cargo.toml
index 3d75c5692..7115b4057 100644
--- a/all-is-cubes-wasm/Cargo.toml
+++ b/all-is-cubes-wasm/Cargo.toml
@@ -6,7 +6,7 @@ name = "all-is-cubes-wasm"
 version = "0.8.0"
 authors = ["Kevin Reid <kpreid@switchb.org>"]
 edition = "2021"
-rust-version = "1.81"
+rust-version = "1.82"
 description = "Web client for the recursive voxel game All is Cubes."
 # TODO: add homepage = "..." when we have one
 repository = "https://github.com/kpreid/all-is-cubes"
diff --git a/all-is-cubes/src/behavior.rs b/all-is-cubes/src/behavior.rs
index 8056fd16a..9f5e77a67 100644
--- a/all-is-cubes/src/behavior.rs
+++ b/all-is-cubes/src/behavior.rs
@@ -191,7 +191,7 @@ impl<H: Host> BehaviorSet<H> {
                     }
                 },
             )
-            .filter(move |qi| type_filter.map_or(true, |t| (*qi.behavior).type_id() == t))
+            .filter(move |qi| type_filter.is_none_or(|t| (*qi.behavior).type_id() == t))
     }
 
     pub(crate) fn step(
diff --git a/all-is-cubes/src/block/attributes.rs b/all-is-cubes/src/block/attributes.rs
index 69b7c3bcd..f1384927e 100644
--- a/all-is-cubes/src/block/attributes.rs
+++ b/all-is-cubes/src/block/attributes.rs
@@ -137,6 +137,7 @@ impl BlockAttributes {
         Self::DEFAULT
     }
 
+    #[mutants::skip] // currently used only as an optimization, and hard to test usefully
     pub(crate) fn rotationally_symmetric(&self) -> bool {
         let Self {
             display_name: _,
@@ -150,12 +151,12 @@ impl BlockAttributes {
 
         inventory.rotationally_symmetric()
             && rotation_rule.rotationally_symmetric()
-            && !tick_action
+            && tick_action
                 .as_ref()
-                .is_some_and(|a| !a.rotationally_symmetric())
-            && !activation_action
+                .is_none_or(|a| a.rotationally_symmetric())
+            && activation_action
                 .as_ref()
-                .is_some_and(|a| !a.rotationally_symmetric())
+                .is_none_or(|a| a.rotationally_symmetric())
     }
 
     pub(crate) fn rotate(self, rotation: GridRotation) -> BlockAttributes {
diff --git a/all-is-cubes/src/block/eval/evaluated.rs b/all-is-cubes/src/block/eval/evaluated.rs
index d5345f0ae..5af6d729c 100644
--- a/all-is-cubes/src/block/eval/evaluated.rs
+++ b/all-is-cubes/src/block/eval/evaluated.rs
@@ -289,7 +289,7 @@ impl EvaluatedBlock {
         let inventory = inv::Inventory::from_slots(
             itertools::Itertools::zip_longest(
                 contents,
-                core::iter::repeat(inv::Slot::Empty).take(config.size),
+                core::iter::repeat_n(inv::Slot::Empty, config.size),
             )
             .map(|z| z.into_left())
             .collect::<Box<[inv::Slot]>>(),
diff --git a/all-is-cubes/src/content/palette.rs b/all-is-cubes/src/content/palette.rs
index f5dee5acf..98d0d118e 100644
--- a/all-is-cubes/src/content/palette.rs
+++ b/all-is-cubes/src/content/palette.rs
@@ -14,7 +14,6 @@
 //
 // 0xBB is the sRGB value approximating linear value 0.5.
 
-#![allow(unknown_lints)] // TODO: remove after Rust 1.82 is released
 #![allow(clippy::too_long_first_doc_paragraph, reason = "false positive on SVG")]
 
 use crate::math::{rgb_const, Rgb};
diff --git a/all-is-cubes/src/drawing.rs b/all-is-cubes/src/drawing.rs
index aaca36c83..f3c274f27 100644
--- a/all-is-cubes/src/drawing.rs
+++ b/all-is-cubes/src/drawing.rs
@@ -72,7 +72,6 @@ pub fn rectangle_to_aab(rectangle: Rectangle, transform: Gridgid, max_brush: Gri
     // way, since it is precisely about identifying the volume occupied by drawing a
     // 2D-pixel.
 
-    #![allow(unknown_lints)] // TODO: remove after Rust 1.82 is released
     #![allow(clippy::too_long_first_doc_paragraph)] // TODO: find better phrasing
 
     if rectangle.size.width == 0 || rectangle.size.height == 0 {
diff --git a/all-is-cubes/src/space/light/queue.rs b/all-is-cubes/src/space/light/queue.rs
index 940479f82..a54d4b622 100644
--- a/all-is-cubes/src/space/light/queue.rs
+++ b/all-is-cubes/src/space/light/queue.rs
@@ -211,9 +211,10 @@ impl LightUpdateQueue {
 
     /// Removes and returns the highest priority queue entry.
     #[inline]
+    #[mutants::skip] // if it fails to pop, causes hangs
     pub fn pop(&mut self) -> Option<LightUpdateRequest> {
         if let Some(sweep) = &mut self.sweep {
-            if peek_priority(&self.queue).map_or(true, |p| self.sweep_priority > p) {
+            if peek_priority(&self.queue).is_none_or(|p| self.sweep_priority > p) {
                 if let Some(cube) = sweep.next() {
                     return Some(LightUpdateRequest {
                         cube,
diff --git a/all-is-cubes/src/space/light/updater.rs b/all-is-cubes/src/space/light/updater.rs
index b96263385..b3829a47f 100644
--- a/all-is-cubes/src/space/light/updater.rs
+++ b/all-is-cubes/src/space/light/updater.rs
@@ -113,11 +113,12 @@ impl LightStorage {
         }
     }
 
+    #[mutants::skip] // lots of ways for this to still work when modified
     pub(crate) fn light_needs_update_in_region(&mut self, region: GridAab, priority: Priority) {
         let Some(region) = region.intersection_cubes(self.contents.bounds()) else {
             return;
         };
-        if !region.volume().is_some_and(|v| v <= 400) {
+        if region.volume().is_none_or(|v| v > 400) {
             self.light_update_queue.sweep(region, priority);
         } else {
             for cube in region.interior_iter() {