warp: if we're building the outgoing buffer, why not count the bytes?

[Vlix]

Before submitting your PR, check that you've:

• Bumped the version number

After submitting your PR:

• Update the Changelog.md file with a link to your PR
• Check that CI passes (or if it fails, for reasons unrelated to your change, like CI timeouts)

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Would this justify a version bump? 🤔

... come to think of it, should the bytesSent type be in Integer, to be able to count more than 2GB on a 32 bit machine?

[kazu-yamamoto]

Nice!

[kazu-yamamoto]

Rebased and merged. Thanks!

[kazu-yamamoto]

Should we release a new version of warp?

[Vlix]

I'll make a PR with the last two changes added to the Changelog, and I think I'm going to change the counting type to Integer, just so there's no chance of hitting the 2,1GB limit on 32-bit machines.
Then we can release warp-3.3.30 (but I can do that too, if necessary 😄 )