Configuration

BOOST_EGG_MAX_ARITY is an overridable configuration macro regulating the maximum supported arity of by_perfect.

Valid expression	Semantics
`BOOST_EGG_MAX_ARITY`	`5` unless overridden.
`#define BOOST_EGG_MAX_ARITY N`	Overrides `BOOST_EGG_MAX_ARITY` by `N`.

	Caution
	`7` or more arity tends to make compile-time very slow.

BOOST_EGG_MAX_LINEAR_ARITY affects the maximum supported arity of by_ref, by_cref and by_value etc.

Valid expression	Semantics
`BOOST_EGG_MAX_LINEAR_ARITY`	`10` unless overridden.
`#define BOOST_EGG_MAX_LINEAR_ARITY N`	Overrides `BOOST_EGG_MAX_LINEAR_ARITY` by `N`.