Code Inspection: Unsound type guard check
typeof x type guard can be unsound in one of the following two cases:
typeof x never corresponds to the specified value (e.g., typeof x === 'number' when x has type 'string | boolean')
typeof x always corresponds to the specified value (e.g., typeof x === 'string' when x has type 'string')
x instanceof A type guard can be unsound in one of the following two cases:
Type of x is not related to A
Type of x is A or a subtype of A
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Last modified: 16 July 2021