Improved performance of Bit constructor with list argument [skip ci]

Author: ankane

pgvector/bit.py

@@ -17,15 +17,12 @@ def __init__(self, value: bytes | str | list[bool] | np.ndarray[tuple[int, ...],
             self._data = value
         elif isinstance(value, (list, str)):
             if isinstance(value, list):
-                def bit_value(v: bool) -> str:
-                    if v is True:
-                        return '1'
-                    if v is False:
-                        return '0'
+                bits = {True: '1', False: '0'}
+                try:
+                    value = ''.join([bits[v] for v in value])
+                except (KeyError, TypeError):
                     raise ValueError('expected list[bool]')
 
-                value = ''.join([bit_value(v) for v in value])
-
             length = len(value)
             if length % 8 != 0:
                 value += '0' * (8 - (length % 8))