#623: updated README (added suggestion for manual column alteration). #633
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This is to fix special characters used in tag names (MySql only).
A tag 'name' is stored by the gem as 'binary encoded string', but if collation is not specified as 'utf8_bin' for that column, all the comparisons are not made properly and thus the unicity constraint expressed by the index 'index_tags_on_name' generate the error you experienced.
Thus for a quick circumvention, you could alter the 'tags' table in the column 'name':