Add ruff lint rule - C4

Author: haydenbaker

packages/smithy-http/src/smithy_http/__init__.py

@@ -25,7 +25,7 @@ def __init__(
         kind: FieldPosition = FieldPosition.HEADER,
     ):
         self.name = name
-        self.values: list[str] = [val for val in values] if values is not None else []
+        self.values: list[str] = list(values) if values is not None else []
         self.kind = kind
 
     def add(self, value: str) -> None:
@@ -99,7 +99,7 @@ def __init__(
         :param encoding: The string encoding to be used when converting the ``Field``
         name and value from ``str`` to ``bytes`` for transmission.
         """
-        init_fields = [fld for fld in initial] if initial is not None else []
+        init_fields = list(initial) if initial is not None else []
         init_field_names = [self._normalize_field_name(fld.name) for fld in init_fields]
         fname_counter = Counter(init_field_names)
         repeated_names_exist = (

pyproject.toml

@@ -46,11 +46,11 @@ black = true
 target-version = "py312"
 
 [tool.ruff.lint]
-# candidates: C4, DTZ, EM, INP, ISC, PERF, PIE, RUF, SIM118, SIM401, SLOT
+# candidates: DTZ, EM, INP, ISC, PERF, PIE, RUF, SIM118, SIM401, SLOT
 # perhaps in the future: N, PYI, TC, TID
 # probably not, a lot of work: DOC, D, PL, TRY
 
-select = [ "ASYNC", "E1", "E4", "E7", "E9", "F", "FURB", "G", "I", "LOG", "S", "T", "UP" ]
+select = [ "ASYNC", "C4", "E1", "E4", "E7", "E9", "F", "FURB", "G", "I", "LOG", "S", "T", "UP" ]
 exclude = [ "packages/smithy-core/src/smithy_core/rfc3986.py" ]
 
 [tool.ruff.lint.per-file-ignores]