AT doesn't work with file ports, though they are allowed in its type spec

[Siskin-Bot]

Submitted by: BrianH

AT should be able to work with ports that are seekable (like files). It currently generates an error. HEAD, TAIL and SKIP all work.

I would like AT port pos to be equivalent to seeking to pos - 1, since port seeking is 0-based and AT is expected to be 1-based. Also, INDEX? on ports is 1-based.

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^{Imported from: CureCode [ Version: alpha 31 Type: Bug Platform: All Category: n/a Reproduce: Always Fixed-in:none ]
Imported from: metaeducation#557}

Comments:

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Rebolbot added the Type.bug on Jan 12, 2016

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