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 - 'mkinmod': Make 'use_of_ff' = "max" the default
 
+- Improve performance by a) avoiding expensive calls in the cost function like merge() and data.frame(), and b) by implementing analytical solutions for SFO-SFO and DFOP-SFO
+
 # mkin 0.9.49.11 (2020-04-20)
 
 - Increase a test tolerance to make it pass on all CRAN check machines