Add a (mostly placeholder) benchmark comparing enum and const.

We do no optimization here, though we could (if it turns out to be
useful, which it's unclear that this benchmark shows).

We'd also need to be careful that we don't mismark validation error
details if we did swap keywords here.

Author: Julian

jsonschema/benchmarks/const_vs_enum.py

@@ -0,0 +1,30 @@
+"""
+A benchmark for comparing equivalent validation of `const` and `enum`.
+"""
+
+from pyperf import Runner
+
+from jsonschema import Draft202012Validator
+
+value = [37] * 100
+const_schema = {"const": list(value)}
+enum_schema = {"enum": [list(value)]}
+
+valid = list(value)
+invalid = [*valid, 73]
+
+const = Draft202012Validator(const_schema)
+enum = Draft202012Validator(enum_schema)
+
+assert const.is_valid(valid)
+assert enum.is_valid(valid)
+assert not const.is_valid(invalid)
+assert not enum.is_valid(invalid)
+
+
+if __name__ == "__main__":
+    runner = Runner()
+    runner.bench_func("const valid", lambda: const.is_valid(valid))
+    runner.bench_func("const invalid", lambda: const.is_valid(invalid))
+    runner.bench_func("enum valid", lambda: enum.is_valid(valid))
+    runner.bench_func("enum invalid", lambda: enum.is_valid(invalid))

pyproject.toml

@@ -214,4 +214,4 @@ from-first = true
 "docs/*" = ["ANN", "D", "INP001"]
 "jsonschema/tests/*" = ["ANN", "D", "RUF012", "S", "PLR", "PYI024", "TRY"]
 "jsonschema/tests/test_format.py" = ["ERA001"]
-"jsonschema/benchmarks/*" = ["ANN", "D", "INP001"]
+"jsonschema/benchmarks/*" = ["ANN", "D", "INP001", "S101"]