refactor(ops): op2 supports strings in argument and return position (#19613)

Support strings (&str, String, and Cow) in the argument position and String in the return position. Avoids
copies where possible, though this is not always something we can do.

1 files changed, 4 insertions, 0 deletions

diff --git a/ops/op2/test_cases/sync/string_ref.rs b/ops/op2/test_cases/sync/string_ref.rs
new file mode 100644
index 000000000..a7efa9f0c
--- /dev/null
+++ b/ops/op2/test_cases/sync/string_ref.rs
@@ -0,0 +1,4 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+#[op2(fast)]
+fn op_string_owned(#[string] s: &str) -> u32 {}