Upgrading from 12 to 16 gives you 4.0 years worth of changes and fixes (1 of them)

List of changes:

• ⇑ Upgrade to 15 released on 2022-10-13 - docs

  • On non-Windows platforms, consult the HOME environment variable to find the user's home directory (Anders Kaseorg)

    If HOME is empty or unset, fall back to the previous method of checking the <pwd.h> database. This change affects libpq (for example, while looking up ~/.pgpass) as well as various client application programs.

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