Method _addConstantFact

src/almanac.js:74–77

* Registers fact with the almanac * @param {[type]} fact [description]

(fact)

   * @param {[type]} fact [description]
   */
  _addConstantFact (fact) {
    this.factMap.set(fact.id, fact)
    this._setFactValue(fact, {}, fact.value)
  }

  /**
   * Sets the computed value of a fact