Decrease the number of false positives on Rule duplicated-values - Different keys having the same value should be merged

[David RACODON]

Exclude some patterns such as 'true', 'false', 'yes', 'no', '1', '0', '-1' (case insensitive). Make it a parameter of the rule.
Decrease the default severity of the rule to Major.

[Glayre Nicko]

good idea