diff --git a/masque/file/gdsii.py b/masque/file/gdsii.py
index a28979d..11e1574 100644
--- a/masque/file/gdsii.py
+++ b/masque/file/gdsii.py
@@ -597,19 +597,19 @@ def load_libraryfile(
     path = pathlib.Path(filename)
     stream: IO[bytes]
     if is_gzipped(path):
-        if mmap:
+        if use_mmap:
             logger.info('Asked to mmap a gzipped file, reading into memory instead...')
-            gz_stream = gzip.open(path, mode='rb')
+            gz_stream = gzip.open(path, mode='rb')      # noqa: SIM115
             stream = io.BytesIO(gz_stream.read())       # type: ignore
         else:
-            gz_stream = gzip.open(path, mode='rb')
+            gz_stream = gzip.open(path, mode='rb')      # noqa: SIM115
             stream = io.BufferedReader(gz_stream)       # type: ignore
     else:       # noqa: PLR5501
-        if mmap:
-            base_stream = open(path, mode='rb', buffering=0)
+        if use_mmap:
+            base_stream = path.open(mode='rb', buffering=0)                         # noqa: SIM115
             stream = mmap.mmap(base_stream.fileno(), 0, access=mmap.ACCESS_READ)    # type: ignore
         else:
-            stream = open(path, mode='rb')
+            stream = path.open(mode='rb')          # noqa: SIM115
     return load_library(stream, full_load=full_load, postprocess=postprocess)
 
 
diff --git a/masque/file/utils.py b/masque/file/utils.py
index 95248ae..33f68d4 100644
--- a/masque/file/utils.py
+++ b/masque/file/utils.py
@@ -129,7 +129,7 @@ def clean_pattern_vertices(pat: Pattern) -> Pattern:
 
 
 def is_gzipped(path: pathlib.Path) -> bool:
-    with open(path, 'rb') as stream:
+    with path.open('rb') as stream:
         magic_bytes = stream.read(2)
         return magic_bytes == b'\x1f\x8b'
 
diff --git a/masque/pattern.py b/masque/pattern.py
index e500d1d..47f64c5 100644
--- a/masque/pattern.py
+++ b/masque/pattern.py
@@ -296,7 +296,7 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
         if not annotations_eq(self.annotations, other.annotations):
             return False
 
-        if not ports_eq(self.ports, other.ports):
+        if not ports_eq(self.ports, other.ports):   # noqa: SIM103
             return False
 
         return True
@@ -595,8 +595,7 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
 
         if (cbounds[1] < cbounds[0]).any():
             return None
-        else:
-            return cbounds
+        return cbounds
 
     def get_bounds_nonempty(
             self,
@@ -617,7 +616,7 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
         Returns:
             `[[x_min, y_min], [x_max, y_max]]`
         """
-        bounds = self.get_bounds(library)
+        bounds = self.get_bounds(library, recurse=recurse)
         assert bounds is not None
         return bounds
 
@@ -954,7 +953,7 @@ class Pattern(PortList, AnnotatableImpl, Mirrorable):
         Returns:
             self
         """
-        flattened: dict[str | None, 'Pattern | None'] = {}
+        flattened: dict[str | None, Pattern | None] = {}
 
         def flatten_single(name: str | None) -> None:
             if name is None:
diff --git a/masque/repetition.py b/masque/repetition.py
index 972f3b7..68b6b19 100644
--- a/masque/repetition.py
+++ b/masque/repetition.py
@@ -289,7 +289,7 @@ class Grid(Repetition):
             return True
         if self.b_vector is None or other.b_vector is None:
             return False
-        if any(self.b_vector[ii] != other.b_vector[ii] for ii in range(2)):
+        if any(self.b_vector[ii] != other.b_vector[ii] for ii in range(2)):     # noqa: SIM103
             return False
         return True
 
diff --git a/masque/shapes/arc.py b/masque/shapes/arc.py
index da10d0d..8d14f0f 100644
--- a/masque/shapes/arc.py
+++ b/masque/shapes/arc.py
@@ -286,7 +286,7 @@ class Arc(Shape):
             return thetas
 
         wh = self.width / 2.0
-        if wh == r0 or wh == r1:
+        if wh in (r0, r1):
             thetas_inner = numpy.zeros(1)      # Don't generate multiple vertices if we're at the origin
         else:
             thetas_inner = get_thetas(inner=True)
@@ -308,7 +308,7 @@ class Arc(Shape):
         return [poly]
 
     def get_bounds_single(self) -> NDArray[numpy.float64]:
-        '''
+        """
         Equation for rotated ellipse is
             `x = x0 + a * cos(t) * cos(rot) - b * sin(t) * sin(phi)`
             `y = y0 + a * cos(t) * sin(rot) + b * sin(t) * cos(rot)`
@@ -319,7 +319,7 @@ class Arc(Shape):
           where -+ is for x, y cases, so that's where the extrema are.
 
         If the extrema are innaccessible due to arc constraints, check the arc endpoints instead.
-        '''
+        """
         a_ranges = self._angles_to_parameters()
 
         mins = []
@@ -424,13 +424,13 @@ class Arc(Shape):
                     ))
 
     def get_cap_edges(self) -> NDArray[numpy.float64]:
-        '''
+        """
         Returns:
             ```
             [[[x0, y0], [x1, y1]],   array of 4 points, specifying the two cuts which
              [[x2, y2], [x3, y3]]],    would create this arc from its corresponding ellipse.
             ```
-        '''
+        """
         a_ranges = self._angles_to_parameters()
 
         mins = []
@@ -454,11 +454,11 @@ class Arc(Shape):
         return numpy.array([mins, maxs]) + self.offset
 
     def _angles_to_parameters(self) -> NDArray[numpy.float64]:
-        '''
+        """
         Returns:
             "Eccentric anomaly" parameter ranges for the inner and outer edges, in the form
                    `[[a_min_inner, a_max_inner], [a_min_outer, a_max_outer]]`
-        '''
+        """
         a = []
         for sgn in (-1, +1):
             wh = sgn * self.width / 2
diff --git a/masque/shapes/path.py b/masque/shapes/path.py
index bfaf14f..dfd89f1 100644
--- a/masque/shapes/path.py
+++ b/masque/shapes/path.py
@@ -431,22 +431,22 @@ class Path(Shape):
         return self
 
     def remove_duplicate_vertices(self) -> 'Path':
-        '''
+        """
         Removes all consecutive duplicate (repeated) vertices.
 
         Returns:
             self
-        '''
+        """
         self.vertices = remove_duplicate_vertices(self.vertices, closed_path=False)
         return self
 
     def remove_colinear_vertices(self) -> 'Path':
-        '''
+        """
         Removes consecutive co-linear vertices.
 
         Returns:
             self
-        '''
+        """
         self.vertices = remove_colinear_vertices(self.vertices, closed_path=False)
         return self
 
diff --git a/masque/shapes/polygon.py b/masque/shapes/polygon.py
index 1d52489..f6add4d 100644
--- a/masque/shapes/polygon.py
+++ b/masque/shapes/polygon.py
@@ -415,22 +415,22 @@ class Polygon(Shape):
         return self
 
     def remove_duplicate_vertices(self) -> 'Polygon':
-        '''
+        """
         Removes all consecutive duplicate (repeated) vertices.
 
         Returns:
             self
-        '''
+        """
         self.vertices = remove_duplicate_vertices(self.vertices, closed_path=True)
         return self
 
     def remove_colinear_vertices(self) -> 'Polygon':
-        '''
+        """
         Removes consecutive co-linear vertices.
 
         Returns:
             self
-        '''
+        """
         self.vertices = remove_colinear_vertices(self.vertices, closed_path=True)
         return self
 
diff --git a/masque/traits/copyable.py b/masque/traits/copyable.py
index 91af84b..c652aff 100644
--- a/masque/traits/copyable.py
+++ b/masque/traits/copyable.py
@@ -1,9 +1,8 @@
 from typing import Self
-from abc import ABCMeta
 import copy
 
 
-class Copyable(metaclass=ABCMeta):
+class Copyable:
     """
     Trait class which adds .copy() and .deepcopy()
     """