Hyphens and underscores in mysql.cnf

According to this bug_and - may both be used in mysql / mariadb configuration options inside the mysql.cnf file.

E.g.

[mariadb]
log-bin                         # enable binary logging

and

[mariadb]
log_bin                         # enable binary logging

are both ok!

For googling and searching inside pages the _ variant usually works better.

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