I ran Wireshark and during the last comment, and the following is what I see (some content replaced by asterisks). Perhaps your browser is encoding things differently? Perhaps you're using a different formatting (I'm posting as "Plain Old Text")?
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_3) AppleWebKit/601.4.4 (KHTML, like Gecko) Version/9.0.3 Safari/601.4.4
Referer: http://slashdot.org/comments.p... filter crap)*
Cookie: __utma=*(lameness filter crap)*
*(lameness filter crap)*&postersubj=Re%3ATake+back+Slashdot&postercomment=I+am+using+the+US+International+keyboard%2C+which+is+renamed+to+%22ABC+Extended%22+in+the+latest+version+of+OS+X.++Why+would+the+keyboard+mapping+matter%3F++Doesn%27t+it+create+the+same+character+code%3F++If+plugging+in+and+using+a+standard+UK+keyboard+doesn%27t+work+when+entering+a+GBP+%C2%A3+symbol+%28which+I%27ve+tried%29+then+I+don%27t+suppose+switching+keyboard+mapping+will+work+-+they%27ll+all+generate+the+same+character+code+won%27t+they%3F&nobonus_present=1&postanon_present=1&posttype=1&op=Submit
HTTP/1.1 200 OK
Server: Apache/2.2.3 (CentOS)
Content-Type: text/html; charset=utf-8
Date: Wed, 10 Feb 2016 07:12:26 GMT
Vary: Accept-Encoding, User-Agent
The URLEncoded part decodes to the following, which clearly shows the GBP Â£ Symbol.
postersubj=Re:Take back Slashdot&postercomment=I am using the US International keyboard, which is renamed to "ABC Extended" in the latest version of OS X. Why would the keyboard mapping matter? Doesn't it create the same character code? If plugging in and using a standard UK keyboard doesn't work when entering a GBP Â£ symbol (which I've tried) then I don't suppose switching keyboard mapping will work - they'll all generate the same character code won't they?&nobonus_present=1&postanon_present=1&posttype=1&op=Submit