[b84330808]

Description

load_alias_map_file() opened the alias_map_file JSON with the locale encoding. On Windows that's a legacy code page (cp932 on Japanese Windows, cp1252 on English Windows), so a UTF-8 alias map with non-ASCII table names either stopped pgcli from starting with a UnicodeDecodeError (only FileNotFoundError and JSONDecodeError are caught there) or got decoded into mojibake that never matched the table name. A file saved with a BOM, which some Windows editors add, was rejected as "not valid json" on every platform.

The file is now opened in binary mode, so json detects the encoding itself (UTF-8 with or without a BOM, like any JSON file).

Example on Japanese Windows, with {"注文明細": "om"} as the alias map:

UnicodeDecodeError: 'cp932' codec can't decode byte 0x87 in position 7: illegal multibyte sequence

With the change the alias for 注文明細 is om. The new test fails without the change on Windows (both cases) and on Linux for the BOM case.

Checklist

• I've added this contribution to the changelog.rst.
• I've added my name to the AUTHORS file (or it's already there).

• I installed pre-commit hooks (pip install pre-commit && pre-commit install).
• I verified that my changes work as expected (this may include manually testing them in your local environment, or in other available environments). Cross this out if not relevant (for example, if you're making a documentation change).
• Please squash merge this pull request (uncheck if you'd like us to merge as multiple commits)

I used Claude Code to write this change.

[j-bennet]

@b84330808 thanks for the PR! Looks good, but I see tests failing. Can you take a look?

[b84330808]

Thanks for taking a look! The only failure is test_format_array_output_expanded, and it fails on main too (main's CI has been red since #1650): cli_helpers 2.15.2 now pads the CJK column name by display width. #1653 updates that test's expected output. The new alias_map tests pass on every Python version.