Behaviour of getInsertID() when using save()

getInsertId() is in system/BaseModel.php

This is all that I can find on it.

PHP Code:

    /**
    * Returns last insert ID or 0.
    *
    * @return int|string
    */
    public function getInsertID()
    {
        return is_numeric($this->insertID) ? (int) $this->insertID : $this->insertID;
    } 


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