Both of them dynamically generate specs which close over the iteration variable of a for loop. Closures capture *references*, not values, and so when the variable is mutated on loop iteration its new value is used when the spec is called. This means that instead of running a spec with n different values, we run the spec n times with the same value. This is bad.
common ------ This directory contains common code shared between LMS and CMS, such as Mako templates, CSS, and Coffescript.