polymer: Array mutation methods cause IE to crash

Working on a component that data binds to an array of complex objects. The initial rendering is fine; however, when the data changes, using the mutation methods to modify the property will cause IE to crash.

    this.splice("shapedData.groupedData", 0, this.shapedData.groupedData.length);

for (var x: number = 0; x < newdata.length; ++x) { this.push(“shapedData.groupedData”, newdata[x]); }