Merge remote-tracking branch 'origin/master'

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2023-08-07 c1dafc830993fcedb99a4f2b62178691e1e92e64

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import { OperatorFunction, MonoTypeOperatorFunction } from '../types';
export declare function defaultIfEmpty<T>(defaultValue?: T): MonoTypeOperatorFunction<T>;
export declare function defaultIfEmpty<T, R>(defaultValue?: R): OperatorFunction<T, T | R>;