For example, something like epub is going to be hard because the format is really just a zip file with a specific internal file structure. So, it's not really the .epub file you want to grep, but one of the files within that zip file you want to grep through.
ePub is a zip file contains a batch of HTML file for contents and some XML files for metadata. So you can extract it and do grep as you do for HTML files.
So when they will change this horrible hardcode font fallback list with "normal" font fallback mechanism like Fontconfig?
https://github.com/pop-os/cosmic-text/blob/main/src/font/fallback/unix.rs
Raspberry Pi Zero 2 can run Linux. So you can run mail client on it of course.
The green PCB on left-bottom corner breaks the consistence of design...
It "converts" from and to Ethernet frames, of course. There is not actual L2 difference between PON network and normal fiber ethernet network. In simplified description, it just replace active switch with passive optical splitter.
Yes. Like fiber ethernet, differnet speed need different ONT. But noteworthy, there are some different standards for the same speed level, they are incompatible. For example, EPON and GPON, they are both for 1GbE but incompatible.
I don't know which firewall software you used. But if you use nftables, which support suffix match and conntrack for TCP/UDP, you can block all new (identified by conntrack) income (since privacy extension design for outcome) and allow income with specific suffix (for SLAAC with EUI-64, it will stable), needn't care about which prefix was used.