It would be fantastic to have a function that given the size of raw bytes would cheaply and quickly calculate the size of the final unixfs DAG. This would be useful in cases where the final DAG will be written out into a fixed sized bucket and the user wants to guarantee that each bucket will have the full raw bytes, e.g., FileCoin pieces of size 32GiB.

Other uses of this include pre-allocation of resources or more efficient buffer management depending on the final DAG size for large-scale data intensive applications.