function str$6(a) {
    return "mat3(" + a[0] + ", " + a[1] + ", " + a[2] + ", " + a[3] + ", " + a[4] + ", " + a[5] + ", " + a[6] + ", " + a[7] + ", " + a[8] + ")";
  }
Returns a string representation of a mat3

@param {ReadonlyMat3} a matrix to represent as a string
@returns {String} string representation of the matrix