Add type check for explicit ValueType.BOOLEAN in encode_value

Previously, encode_value with explicit BOOLEAN used Python truthiness
to coerce any value (strings, lists, dicts) to True/False silently.
Now rejects non-bool/int types with a clear EncodeError.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: antoineleclair

src/dqlitewire/types.py

@@ -189,6 +189,8 @@ def encode_value(value: Any, value_type: ValueType | None = None) -> tuple[bytes
             raise EncodeError(f"Cannot infer type for value: {type(value)}")
 
     if value_type == ValueType.BOOLEAN:
+        if not isinstance(value, (bool, int)):
+            raise EncodeError(f"Expected bool or int for BOOLEAN, got {type(value).__name__}")
         return encode_uint64(1 if value else 0), value_type
     elif value_type in (ValueType.INTEGER, ValueType.UNIXTIME):
         if isinstance(value, bool):

tests/test_types.py

@@ -318,6 +318,17 @@ def test_boolean_uses_uint64_encoding(self) -> None:
         assert decode_uint64(encoded_true) == 1
         assert decode_uint64(encoded_false) == 0
 
+    def test_boolean_explicit_rejects_non_bool_non_int(self) -> None:
+        """encode_value with explicit BOOLEAN should reject non-bool/int types."""
+        import pytest
+
+        with pytest.raises(EncodeError, match="[Bb]ool"):
+            encode_value("hello", ValueType.BOOLEAN)
+        with pytest.raises(EncodeError, match="[Bb]ool"):
+            encode_value([1, 2], ValueType.BOOLEAN)
+        with pytest.raises(EncodeError, match="[Bb]ool"):
+            encode_value({"key": "val"}, ValueType.BOOLEAN)
+
     def test_decode_integer(self) -> None:
         value, consumed = decode_value(encode_int64(42), ValueType.INTEGER)
         assert value == 42