src/vs/platform/contextkey/common/contextkey.ts/ContextKeyNotEqualsExpr/create
class ContextKeyNotEqualsExpr:	public static create(key: string, value: any): ContextKeyExpression {
		if (typeof value === 'boolean') {
			if (value) {
				return ContextKeyNotExpr.create(key);
			}
			return ContextKeyDefinedExpr.create(key);
		}
		const staticValue = STATIC_VALUES.get(key);
		if (typeof staticValue === 'boolean') {
			const falseValue = staticValue ? 'true' : 'false';
			return (value === falseValue ? ContextKeyFalseExpr.INSTANCE : ContextKeyTrueExpr.INSTANCE);
		}
		return new ContextKeyNotEqualsExpr(key, value);
	}