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Properly check whether string is string because js is js #1

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Properly check whether string is string because js is js #1

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2 changes: 1 addition & 1 deletion common.mts
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Original file line number Diff line number Diff line change
Expand Up @@ -38,7 +38,7 @@ export function isNumber(arg: any): arg is number {
}

export function isString(arg: any): arg is string {
return typeof(arg) === 'string';
return typeof(arg) === 'string' || arg instanceof String;
}

export function isBoolean(arg: any): arg is boolean {
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