================
@@ -58,23 +59,156 @@ namespace __format {
/// This helper is used together with the @ref back_insert_iterator to offer
/// type-erasure for the formatting functions. This reduces the number to
/// template instantiations.
+///
+/// The design of the class is being changed to improve performance and do some
+/// code cleanups.
+/// The original design (as shipped up to LLVM-19) uses the following design:
+/// - There is an external object that connects the buffer to the output.
+/// - The class constructor stores a function pointer to a grow function and a
+/// type-erased pointer to the object that does the grow.
----------------
ldionne wrote:
```suggestion
/// - The class constructor stores a function pointer to a "grow" function and a
/// type-erased pointer to the object that should be grown.
```
https://github.com/llvm/llvm-project/pull/101817
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