Steps to reproduce

• runs f.tell() on a TextIOWrapper, which returns an "opaque number", which is not the number of bytes, but this number is used as such afterwards
• does not explicitly open the file in a locale-independent way
• does not allow users to specify a different text encoding
• creates a file backup in an unsafe way
• (does not preserve hardlinks, but i guess we can live with that)

Error message

No response

Information on your system

• Spack: 0.24.0.dev0 (a3985e7)
• Python: 3.13.0
• Platform: linux-ubuntu24.04-zen2

General information

• I have run spack debug report and reported the version of Spack/Python/Platform
• I have searched the issues of this repo and believe this is not a duplicate
• I have run the failing commands in debug mode and reported the output