3 bytes unicode character doesn't work in gist comments: 𝄞

test 𝄞

𝄞

//from http://de.wikipedia.org/wiki/Utf8#Kodierung
Char	   Unicode	Unicode  binary	  UTF-8 binary	                                         UTF-8 hex

Violinschlüssel 𝄞	U+1D11E	00000001 11010001 00011110	11110000 10011101 10000100 10011110	F0 9D 84 9E

this is the error:

ERMAHGERD, 500.
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Remote Address:192.30.252.140:443
Request URL:https://gist.github.com/timaschew/767c260194baadbb0297/comments
Request Method:POST
Status Code:500 Internal Server Error
Request Headersview source
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding:gzip,deflate,sdch
Accept-Language:de-DE,de;q=0.8,en-US;q=0.6,en;q=0.4
Cache-Control:max-age=0
Connection:keep-alive
Content-Length:195
Content-Type:application/x-www-form-urlencoded
Cookie:******
Host:gist.github.com
Origin:https://gist.github.com
Referer:https://gist.github.com/timaschew/767c260194baadbb0297
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36
Form Dataview sourceview URL encoded
utf8:✓
authenticity_token:************
gist:13386228
comment[body]:>>>>>   __TREBLE_CLEF_CHAR__
Response Headersview source
Content-Length:1566
Content-Type:text/html; charset=utf-8
Date:Mon, 21 Jul 2014 08:24:41 GMT
Server:GitHub.com
Status:500 Internal Server Error
Strict-Transport-Security:max-age=31536000
X-GitHub-Request-Id:4FC258B4:55C4:61D909:53CCCE3D
X-Request-Id:b26b6f40-6e6e-4089-8682-69a6e2cc6fa9
X-Runtime:0.012703