I128(-42) instead of I64(-42)

Another thing I don't understand:

{% set m = {
    "key1": 42,
    "key2": -42,
    "key3": 42.424242,
    "key4": -42.424242,
} %}

In the debug mode, I take a look and see I128(-42).

Map(String("key1"): I64(42), String("key2"): I128(-42), String("key3"): F64(42.424242), String("key4"): F64(-42.424242))

Why? What is the reason for this?

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