Yes exactly. You replace the chunk with “he” and “llo” then insert the extra item in the middle. The result is [“he”, “e”, “llo”]. The code to do all this inlin

Yes exactly. You replace the chunk with “he” and “llo” then insert the extra item in the middle. The result is [“he”, “e”, “llo”]. The code to do all this inline in a b-tree is pretty hairy but it works pretty well!