module Eliom_wrap:sig..end
type 'a wrapped_value
type +'a wrapper
'a wrapper is the type of values to include into a value of type 'a for
it to be wrapped specifically
val create_wrapper : ('a -> 'b) -> 'a wrappercreate f create a new tag that can be included into a value. if
wrap is called on a father of a value v containing a tag, the
value v will be replaced by f v before marshaling.
marshal a value, taking into account the tags.
val wrap : 'a -> 'a wrapped_value
val empty_wrapper : 'a wrappera wrapper that do not change the value