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?_ rune #24

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?_ rune #24

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0082c69
?_ rune
xiphiness Aug 21, 2023
ab60c8c
?_ does *not* implement STUN
xiphiness Aug 21, 2023
52cfb66
Update UIP-0014.md
xiphiness Oct 2, 2023
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32 changes: 32 additions & 0 deletions UIPS/UIP-0014.md
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---
uip: 0114
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please quote the UIP so GH doesn't parse it as octal

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Suggested change
uip: 0114
uip: "0114"

title: ?_ rune, noun equality restricts type to left parameter
description: for use with dependently typed maps and other related value-based type inference
author: ~sarpen-laplux (@xiphiness)
status: Draft
type: Standards Track
category: Kernel
created: ~2023.8.9
---

## Abstract

This PR introduces a new rune ?_(a=hoon b=wing), subject to renaming, whose compiled nock is equivalent to .=, but refines the type of b to that of a on noun equality.

## Specification

See https://github.com/urbit/urbit/pull/6656
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Please reproduce the spec here.

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done, and expanded upon it


## Rationale

This procedure can be generalized to work with arbitrary ships, but it's not necessary that it be used for anyone other than our galaxy until we either start forwarding through stars, or need some keep-alive mechanism for "sticky" scry requests. Both of those are planned for the future. The current design keeps formal pings from /app/ping to the rest of the (non-galaxy) sponsorship hierarchy. These could be removed, since galaxies can statelessly forward packets from the sponsor star to the sponsee.

Initially only galaxies will need to act as STUN servers, but any ship could support STUN requests. These could be used to check connectivity with other ships outside of the event loop, and, if additionally listening on a standard port, could provide useful service to applications running outside of urbit (such as webrtc clients).

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STUN with ?_!

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it's a very cool, entirely unexpected feature!

## Backwards Compatibility

This PR properly would at least modify map and ordered map, and should make sure that this doesn't break compilation everywhere those are used.

## Copyright

Copyright and related rights waived via [CC0](../LICENSE.md).