fix(io): readDelim returns wrong result if delim strides over chunks

[keroxp]

• This is bug from fix(io): Improve readDelims() performance #867
• @ry Sorry, would you see this?

[kfdf]

Nice to see the issue #803 is being handled, but as I mentiond before, the createLPS function is still bugged. This causes an infinite loop:

import { readStringDelim } from 'https://deno.land/std@0.95.0/io/mod.ts'
readStringDelim(null, '1213').next()

As may the use of very long delimiters (longer than 256 bytes).

[keroxp]

@kfdf Oh, that's true! Also fixed on 82b327a

[kt3k]

@keroxp Thank you for the fix! LGTM

@kfdf Thank you for your review!