array_multisort throws "Unable to delete property."

[Oleg Andreyev]

Browser: PhantomJS
Code:

'use strict`
array_multisort(["productIds[]", "_"], 'SORT_ASC', ["productIds[]=977385529", "_=1502965788347"])

Error: array_multisort.js:171 Unable to delete property.
delete sortKeys[i]

Ref.: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode

Third, strict mode makes attempts to delete undeletable properties throw (where before the attempt would simply have no effect):

'use strict';
delete Object.prototype; // throws a TypeError

[Oleg Andreyev]

after creating sortArrs[0], we're creating sortArrs[2] instead of sortArrs[1], and because sequences is broken (not 0,1,2...) sortArrs.length will be 3, instead of 2

[Oleg Andreyev]

We've found another issue but under Edge:

Calling delete on '0' is not allowed in strict mode

Near this line:

if (arguments[i].hasOwnProperty(k)) {
                                delete arguments[i][k];
                            }