src/script.js
function isOPInt (value) {
  return types.Number(value) &&
    ((value === OPS.OP_0) ||
      (value >= OPS.OP_1 && value <= OPS.OP_16) ||
      (value === OPS.OP_1NEGATE));
}
function isOPInt (value) {
  return types.Number(value) &&
    ((value === OPS.OP_0) ||
      (value >= OPS.OP_1 && value <= OPS.OP_16) ||
      (value === OPS.OP_1NEGATE));
}
function isOPInt ( value ) { return types . Number ( value ) && ( ( value === OPS . OP_0 ) || ( value >= OPS . OP_1 && value <= OPS . OP_16 ) || ( value === OPS . OP_1NEGATE ) ) ; }
OP_1 - 1
OP_1 - 1