Exclude `.` and `..` from pathname expansion results

[magicant]

Current behavior:

• Expansion of .* includes . and ..

Expected behavior:

• Expansion of .* does not include . or ..

Reference:

• POSIX XCU 2.6.6 Pathname Expansion
• POSIX XCU 2.14.3 Patterns Used for Filename Expansion

Rationale:

• The new behavior is not strictly required by POSIX.1-2024, but it is suggested that the new behavior may be required in the future. Since bash, ksh, mksh, and zsh already filter out . and .., it would be high time for us to support it.