textio readUnsignedInt & readSignedInt fail to compile

[nitely]

readUnsignedInt requires isDigit which is not imported. readSignedInt does s.read.peek which wont compile. Given this issue was not raised in 5 years, they should just be removed IMO. Otherwise, fix them so they work, and they return an Optional value, which should be none on int overflow.

[arnetheduck]

an option is to review the existing readers (ie json, toml etc) and see if there's enough common ground - I guess the problem with these functions is that when you're parsing something like json, an overflowing int can be valid json but not valid high-level type and these two error kinds need to be differentiated.