Comment made by: wagjo
Related ticket CLJ-1227 and related quote from Alex:
{quote}
definline is considered to be an experimental feature and Rich would like to discourage its use as the hope is to remove it in the future. The desired replacement is something like common lisp compiler macros that could allow the compiler to detect special situations and optimize the result but leave behind a function invocation for the case where no special behavior is available.
{quote}