rem: this.slice(0, length - truncation.length) + truncation : this; 
add: this.slice(0, length - truncation.length) + truncation : String(this); 
context:   truncate: function(length, truncation) {    length = length || 30;    truncation = truncation === undefined ? '...' : truncation;    return this.length > length ?      this.slice(0, length - truncation.length) + truncation : this;  },
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