Feature request - "max split" functionality for xsv split

[mxr]

Hello, thanks for this great tool. For my use case, I want to split a file into two chunks - a small chunk and a large chunk. The small chunk serves as "canary" to verify an operation. Once verified, I can repeat the operation with the large chunk.

I looked into doing this with xsv split, however it will split the file into $$n$$ chunks of size $$m$$, whereas I'm looking to split the file into two chunks (one of size $$m$$ and the other of size $$m \times (n-1)$$). Although I can re-join the $$n-1$$ chunks using xsv cat rows, this is a bit finicky.

Looking at other languages, Python's str.split has a maxsplit argument, Go has strings.SplitN, and Rust has str.splitn. Would you consider a similar argument to xsv split? Thanks!