Avoid (by alerting) stringified number used as key into Map

MapTypeCheck.js

( function() {
	const
		protoHas = Map.prototype.has,
		protoGet = Map.prototype.get,
		protoSet = Map.prototype.set,
		protoDelete = Map.prototype.delete;

	Map.prototype.has = function( id ) {
		if ( typeof id === "string" && !isNaN( +id ) ) {
			console.warn( `Map.has( "${ id }" )` );
		}
		return protoHas.call( this, id );
	};
	Map.prototype.get = function( id ) {
		if ( typeof id === "string" && !isNaN( +id ) ) {
			console.warn( `Map.get( "${ id }" )` );
		}
		const res = protoGet.call( this, id );
		if ( res === undefined ) {
			console.warn( `Map.get( "${ id }" )`, undefined );
		}
		return res;
	};
	Map.prototype.set = function( id, val ) {
		if ( typeof id === "string" && !isNaN( +id ) ) {
			console.warn( `Map.set( "${ id }", ${ val } )` );
		}
		return protoSet.call( this, id, val );
	};
	Map.prototype.delete = function( id ) {
		if ( typeof id === "string" && !isNaN( +id ) ) {
			console.warn( `Map.delete( "${ id }" )` );
		}
		return protoDelete.call( this, id );
	};
} )();