constFEED_BOUNDS: std::ops::RangeFrom<usize>=2..;//TODO: Add to config somehow
/// Feed `what` into `chain`, at least `bounds` tokens.
///
/// # Tokenising
/// How the tokens are split within this function that operates on single buffers is determined largely by the features `split-sentance` and `feed-sentance` determining the use of the sentance API.
///
/// ## Pipeline
/// Since this is called on single buffers, it happens after the `split-newlines` tokenising if it's enabled, and thus the sentance API is only able to operate on each seperate line if that feature is enabled, regardless of `always-aggre`, or `feed-sentance` or `split-sentance`.
/// This is the pipeline for just within this function, after splitting through newlines if enabled.
///
/// * `feed-sentance`
/// ** Feed the buffer through the sentance split tokeniser
/// ** Feed the sentances through the word split tokeniser
/// ** Feed each collection of words into the chain seperately
/// * `split-sentance`
/// ** Feed the buffer through the sentance split tokeniser
/// ** Feed the sentances through the word split tokeniser
/// ** Feed the flattened collection into the chain once, concatenated.
/// * Neither
/// ** Feed the buffer through the word split tokeniser