Rule request: AvoidDefaultEncoding

Apparently the default encoding -Encoding Default is removed from the cmdlet documentation that supports the -Encoding parameter. See e.g.:

• https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.management/get-content?view=powershell-5.1
• https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.management/get-content?view=powershell-7.5

Which makes sense in a way that this might cause compatibility issues when something is e.g. written (using -Encoding Default in Windows PowerShell 5.1 and read back in PowerShell 7 (e.g. after a PowerShell update migration). Yet, afaik, this isn't captured by any of the UseCompatibleCommands profiles either (probably because the default value is still accepted.

Also note:

• that using any of the newer encoding values as Ansi and utf8NoBom in PowerShell 7 might cause an incompatibility issue with older versions of PowerShell.
• the implementation of the -Encoding utf8 value also differs between Windows PowerShell and newer versions of PowerShell:
  • Character encoding in Windows PowerShell: UTF8 Uses UTF-8 (with BOM).
  • Character encoding in PowerShell: utf8: Encodes in UTF-8 format (no BOM).

Therefore I think that it is wise to avoid the default and utf8 encoding (-Encoding Default and -Encoding utf8) when PSUseCompatibleCommands is enabled in the PSScriptAnalyzer settings.

先檢視 PSUseCompatibleCommands 規則及其相容性設定檔，然後比較連結的 Windows PowerShell 和 PowerShell 編碼文件。在啟用相容性分析時，定義 -Encoding Default 和 -Encoding utf8 的預期診斷，包括應如何處理較新的值 Ansi 和 utf8NoBom；當規則行為和相應的涵蓋率反映該決定時，此 issue 即完成。