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In #2638140: Error logging should log a backtrace consistently we made _drupal_log_error use a 'backtrace_string' argument if passed in. In order to display this we had to move it to '@backtrace_string'. In Drupal 9 we should just change the error methods to create a '@backtrace_string' property instead.
Comments
Comment #2
alexpottThe original fix did this - we decided that it was not a BC break.