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Byte 0, not byte 1, is the start byte, and it should be F0, as in output below. However, I now see "invalid continuation byte'.
In 2.7.5,
# -*- coding: utf-8 -*-
s = b'𐒢' # output same if uncomment following lines
#s = u'𐒢'.encode('utf-8') # '𐒢' pasted in from 1st post
#s = u'\U000104a2'.encode('utf-8') 
print(len(s))
for c in s: print(ord(c), hex(ord(c)))
>>> 
4
(240, '0xf0')
(144, '0x90')
(146, '0x92')
(162, '0xa2')
I have no idea how the second pasted byte becomes ED in 3.x.
Attempting to open the file in 3.x results in a broken* 'Untitled' edit window and the following error message in the console.
_tkinter.TclError: character U+104a2 is above the range (U+0000-U+FFFF) allowed by Tcl
* Attempting to close the window either immediately or after entering text results in
AttributeError: 'PyShellEditorWindow' object has no attribute 'extensions'
I have to close the initial python process to get rid of it.