Type generation malforming objects with number-like keys about dtsgenerator HOT 5 CLOSED

It's related to this line https://github.com/horiuchi/dtsgenerator/blob/master/src/core/astBuilder.ts#L12
When i remove the mentioned condition, proper types are generated, while still keeping types and interfaces prefixed with $ if they start with number.
There might be some corner cases that I'm not able to see, but this seems like base for the solution.

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@dmiorandi Thank you for your report!
I mistakenly thought that all identifiers could not always start with a number.
As for property identifiers, since numbers are also used in Array, we can be defined with words starting with numbers.
I need to sort out which character types can be used for each identifier.

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The definition of the identifier was a bellow page, but the key of the property was defined as a string literal, so it was different.
https://tc39.es/ecma262/#sec-names-and-keywords

Also, I noticed that the current implementation of identifiers does not check for reserved words.

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However, in the current implementation, identifiers do not conflict with reserved words because the first letter is converted to uppercase.

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Released by v3.13.2

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