all: rewrite internal/saferio.SliceCap using generics and add func SliceCapWithSize

[callthingsoff]

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Sense As:

Patch Set 1:

(1 comment)

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Message from Ian Lance Taylor:

Patch Set 1: Commit-Queue+1

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Message from Go LUCI:

Patch Set 1:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2023-08-30T05:18:29Z","revision":"240f63fd6f065a38a5d0cc6930f3ccc63cbe77f8"}

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Message from Ian Lance Taylor:

Patch Set 1: -Commit-Queue

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Patch Set 1:

This CL has passed the run

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Message from Go LUCI:

Patch Set 1: LUCI-TryBot-Result+1

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Message from Rob Pike:

Patch Set 1: Hold+1

(1 comment)

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Message from Russ Cox:

Patch Set 1:

(1 comment)

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Message from Russ Cox:

Patch Set 1: Code-Review+2

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This PR is being closed because golang.org/cl/524257 has been merged.