Bugs in getSchema for key of Array indexes

[CJ42]

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Summary

The function getSchema contains the following 3x bugs:

returns keyType = Singleton for data keys of Array Indexes.

const erc725.js = new ERC725([
    {
        "name": "LSP12IssuedAssets[]",
        "key": "0x7c8c3416d6cda87cd42c71ea1843df28ac4850354f988d55ee2eaa47b6dc05cd",
        "keyType": "Array",
        "valueType": "address",
        "valueContent": "Address"
    }
])

// data key for `LSP12IssuedAssets[4]` at index 4
erc725js.getSchema("0x7c8c3416d6cda87cd42c71ea1843df2800000000000000000000000000000004")

returns null for data key of array indexes bigger than 9.

const erc725.js = new ERC725([
    {
        "name": "LSP12IssuedAssets[]",
        "key": "0x7c8c3416d6cda87cd42c71ea1843df28ac4850354f988d55ee2eaa47b6dc05cd",
        "keyType": "Array",
        "valueType": "address",
        "valueContent": "Address"
    }
])

// data key for `LSP12IssuedAssets[10]` at index 10
erc725js.getSchema("0x7c8c3416d6cda87cd42c71ea1843df280000000000000000000000000000000a")

Other information (e.g. detailed explanation, stack traces, related issues, suggestions how to fix, links for us to have context, eg. StackOverflow, personal fork, etc.)