Ugly hack to fix mypy warnings

.github/workflows/main.yml

@@ -17,10 +17,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install pytest mypy
+        pip install pytest
     - name: Run tests
       run: |
         pytest tests/
-    # - name: Check types with mypy
-    #   run: |
-    #     mypy .

.github/workflows/types.yml

@@ -0,0 +1,26 @@
+name: Types
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.11"]
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v3
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install mypy pyright
+    - name: Check types with mypy
+      run: |
+        mypy .
+    - name: Check types with pyright
+      run: |
+        pyright .

huffman.py

@@ -17,8 +17,6 @@
 
 import functools
 
-from typing import Optional
-
 FREQUENCY_TABLE = [
 	1 << 30, 4545, 2657, 431, 1950, 919, 444, 482, 2244,
         617, 838, 542, 715, 1814, 304, 240, 754, 212, 647, 186,
@@ -225,19 +223,20 @@ def decompress(self, data: bytes) -> bytes:
         bits = 0
         bitcount = 0
         eof = self.nodes[HUFFMAN_EOF_SYMBOL]
-        node: Optional[Node] = None
+        node = Node(0, 0, 0)
 
         while True:
-            node = None
+            found_node = False
             if bitcount >= HUFFMAN_LUTBITS:
                 node = self.decoded_lut[bits & HUFFMAN_LUTMASK]
+                found_node = True
 
             while bitcount < 24 and src_index < size:
                 bits |= data[src_index] << bitcount
                 src_index += 1
                 bitcount += 8
 
-            if not node:
+            if not found_node:
                 node = self.decoded_lut[bits & HUFFMAN_LUTMASK]
 
             if node.num_bits != 0: