diff --git a/README.md b/README.md
index 350a0d0..d4df9bb 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,6 @@
 
 **Homepage:** https://mpxd.net/code/jan/fatamorgana
 * [PyPI](https://pypi.org/project/fatamorgana)
-* [Github mirror](https://github.com/anewusername/fatamorgana)
 
 **Capabilities:**
 * This package is a work-in-progress and is largely untested -- it works for
@@ -28,12 +27,7 @@
 
 Install with pip from PyPi (preferred):
 ```bash
-pip3 install fatamorgana
-```
-
-Install directly from git repository:
-```bash
-pip3 install git+https://mpxd.net/code/jan/fatamorgana.git@release
+pip install fatamorgana
 ```
 
 ## Documentation
@@ -44,7 +38,6 @@ To read the inline help,
 import fatamorgana
 help(fatamorgana.OasisLayout)
 ```
-The documentation is currently very sparse and I expect to improve it whenever possible!
 
 
 ## Examples
diff --git a/fatamorgana/basic.py b/fatamorgana/basic.py
index fee40dc..70da126 100644
--- a/fatamorgana/basic.py
+++ b/fatamorgana/basic.py
@@ -2,7 +2,7 @@
 This module contains all datatypes and parsing/writing functions for
  all abstractions below the 'record' or 'block' level.
 """
-from typing import Any, IO, Union
+from typing import Any, IO, Union, TYPE_CHECKING
 from collections.abc import Sequence
 from fractions import Fraction
 from enum import Enum
@@ -250,6 +250,7 @@ def write_uint(stream: IO[bytes], n: int) -> int:
     Raises:
         SignedError: if `n` is negative.
     """
+    n = int(n)
     if n < 0:
         raise SignedError(f'uint must be positive: {n}')
 
@@ -295,6 +296,7 @@ def encode_sint(sint: int) -> int:
     Returns:
         Unsigned integer encoding for the input.
     """
+    sint = int(sint)
     return (abs(sint) << 1) | (sint < 0)
 
 
@@ -1211,6 +1213,10 @@ class GridRepetition:
             InvalidDataError: if `b_count` and `b_vector` inputs conflict
                 with each other or if `a_count < 1`.
         """
+        a_count = int(a_count)
+        if b_count is not None:
+            b_count = int(b_count)
+
         if b_vector is None or b_count is None:
             if b_vector is not None or b_count is not None:
                 raise InvalidDataError('Repetition has only one of'
@@ -1595,7 +1601,7 @@ def read_point_list(
 
 def write_point_list(
         stream: IO[bytes],
-        points: list[Sequence[int]],
+        points: 'list[Sequence[int]] | NDArray',
         fast: bool = False,
         implicit_closed: bool = True
         ) -> int:
@@ -1618,6 +1624,8 @@ def write_point_list(
         Number of bytes written.
     """
     # If we're in a hurry, just write the points as arbitrary Deltas
+    if _USE_NUMPY:
+        points = numpy.asarray(points, dtype=int)
     if fast:
         size = write_uint(stream, 4)
         size += write_uint(stream, len(points))
diff --git a/fatamorgana/records.py b/fatamorgana/records.py
index 88863a7..a137b42 100644
--- a/fatamorgana/records.py
+++ b/fatamorgana/records.py
@@ -1434,7 +1434,7 @@ class Placement(Record):
                 size += self.name.write(stream)             # type: ignore
         if mm:
             size += write_real(stream, self.magnification)  # type: ignore
-        if aa:
+        if aq:
             size += write_real(stream, self.angle)          # type: ignore
         if xx:
             size += write_sint(stream, self.x)              # type: ignore
@@ -1717,8 +1717,8 @@ class Polygon(Record, GeometryMixin):
     repetition: repetition_t | None
     point_list: point_list_t | None
     """
-    List of offsets from the initial vertex (x, y) to the remaining
-    vertices, `[[dx0, dy0], [dx1, dy1], ...]`.
+    List of offsets between consecutive vertices, starting from the initial
+    vertex (x, y): `[[dx0, dy0], [dx1, dy1], ...]`.
     The list is an implicitly closed path, vertices are [int, int].
     The initial vertex is located at (x, y) and is not represented in `point_list`.
     `None` means reuse modal.
@@ -1744,7 +1744,7 @@ class Polygon(Record, GeometryMixin):
         self.point_list = point_list
         self.properties = [] if properties is None else properties
 
-        if point_list is not None and len(point_list) < 3:
+        if point_list is not None and len(point_list) < 2:
             warn('Polygon with < 3 points', stacklevel=2)
 
     def get_point_list(self) -> point_list_t:
@@ -1827,8 +1827,8 @@ class Path(Record, GeometryMixin):
     repetition: repetition_t | None = None
     point_list: point_list_t | None = None
     """
-    List of offsets from the initial vertex (x, y) to the remaining vertices,
-    `[[dx0, dy0], [dx1, dy1], ...]`.
+    List of offsets between consecutive vertices, starting from the initial
+    vertex (x, y): `[[dx0, dy0], [dx1, dy1], ...]`.
     The initial vertex is located at (x, y) and is not represented in `point_list`.
     Offsets are [int, int]; `None` means reuse modal.
     """
@@ -1960,7 +1960,7 @@ class Path(Record, GeometryMixin):
         dd = self.datatype is not None
         ll = self.layer is not None
 
-        size = write_uint(stream, 21)
+        size = write_uint(stream, 22)
         size += write_bool_byte(stream, (ee, ww, pp, xx, yy, rr, dd, ll))
         if ll:
             size += write_uint(stream, self.layer)       # type: ignore
diff --git a/pyproject.toml b/pyproject.toml
index c91c0d1..9c149ed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,15 +34,14 @@ keywords = [
     ]
 classifiers = [
     "Programming Language :: Python :: 3",
-    "Development Status :: 3 - Alpha",
-    "Environment :: Other Environment",
+    "Development Status :: 4 - Beta",
     "Intended Audience :: Developers",
     "Intended Audience :: Information Technology",
     "Intended Audience :: Manufacturing",
     "Intended Audience :: Science/Research",
     "License :: OSI Approved :: GNU Affero General Public License v3",
-    "Topic :: Scientific/Engineering",
     "Topic :: Scientific/Engineering :: Electronic Design Automation (EDA)",
+    "Topic :: File Formats",
     ]
 requires-python = ">=3.11"
 dynamic = ["version"]