`replace` can not accept a unicode character like \u{FEFF}

[Dirreke]

Feature Description

I use readfile to read a file with utf-8-BOM and I get a string start with \u{FEFF}, which means BOM and we can not see it when we print it. I have no idea about delete it.

(using utf-8-BOM because if set the output format of powershell to utf-8(the default is utf-16LE), it will always use BOM to create file.)

by the way, if readfile will support more encoding format like utf-16LE, GBK ...

Describe The Solution You'd Like

make replace able to accept the unicode character.

[sagiegurari]

@Dirreke there is readbinfile for reading binary files and getting raw data so encoding won't impact anything.
or you can improve the readfile implementation via PR?