src/vs/platform/contextkey/common/contextkey.ts/ContextKeySmallerEqualsExpr/cmp
class ContextKeySmallerEqualsExpr:	public cmp(other: ContextKeyExpression): number {
		if (other.type !== this.type) {
			return this.type - other.type;
		}
		return cmp2(this.key, this.value, other.key, other.value);
	}