Purpose of and rationale behind Go Markers U+2686 to U+2689

[Andrew West]

On 10 March 2016 at 11:34, Leonardo Boiko <leoboiko at gmail.com> wrote:
> Isn't it better to use some sort of COMBINING ENCLOSING CIRCLE?

Of course that approach is possible, but it is quite problematic, both
from the perspective of the font developer and the end user, because
the circle would have to be able to combine with an indefinite number
of preceding characters, and it is not easy to either determine where
the boundary is (in the font) or specify the boundary (by the end
user).  For example, given a text string of "1234<combining circle>"
what does the combining circle combine with?  Unitary characters would
be just way simpler and more reliable.

Andrew