@history_length(variable)
This is a special form: the argument must be a variable (it cannot be a general expression). It returns the maximal length of the history of the variable, i.e. the number of update that are recorded.
@history_length(variable)
This is a special form: the argument must be a variable (it cannot be a general expression). It returns the maximal length of the history of the variable, i.e. the number of update that are recorded.
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