support boolean as PK (make sense if it's part of composite key)

Author: Mate Valko

sqeleton/abcs/database_types.py

@@ -24,10 +24,6 @@ class PrecisionType(ColType):
     rounds: Union[bool, Unknown] = Unknown
 
 
-class Boolean(ColType):
-    precision = 0
-
-
 class TemporalType(PrecisionType):
     pass
 
@@ -82,6 +78,10 @@ def python_type(self) -> type:
         return decimal.Decimal
 
 
+class Boolean(ColType, IKey):
+    precision = 0
+    python_type = bool
+
 @dataclass
 class StringType(ColType):
     python_type = str