Ordering of keys with objectKeys

[BernieWhite]

Bicep version

Bicep CLI version 0.27.1 (4b41cb6d4b)

Describe the bug

The objectKeys function is described by:

Returns an array of object keys. Elements are consistently ordered alphabetically.

While this is technically true, it also might be ambiguous in the context of character casing.

To Reproduce

Consider:

output example3 string[] = objectKeys({ a: 1, b: 2 }) // returns [ 'a', 'b' ]
output example3a string[] = objectKeys({}) // returns []
output example3b string[] = objectKeys({ b: 2, a: 1 }) // returns [ 'a', 'b' ]
output example3c string[] = objectKeys({ A: 2, a: 1 }) // returns [ 'A', 'a' ]
output example3d string[] = objectKeys({ a: 2, A: 1 }) // returns [ 'a', 'A' ]

In short A and a from the example are not sorted.

While unlikely to occur on standard ARM resource properties in isolation. Flagging that this might cause non-deterministic behaviour that is confusing for customers.