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You can (and should!) read the PKGBUILDs, they're very small and should always be manually inspected before install.

The -bin suffix is an AUR convention to let you know that it's downloading a precompiled binary rather than building from source.

If we're talking about conventions, it's also an AUR convention to use -vcs suffix for source builds (like -git), for example:

And the version of VCS AUR entries is just from the last time the PKGBUILD author ran it before uploading.

I thought (but don't know if I ever actually say this documented) that -git and similar meant "latest git commit" not "build form a git repo".