Evaluate MzScheme expression {expr} and return its result converted to Vim data structures. Numbers and strings are returned as they are. Pairs (including lists and improper lists) and vectors are returned as Vim Lists. Hash tables are represented as Vim Dictionary type with keys converted to strings. All other types are converted to string with display function. Examples:

:mz (define l (list 1 2 3))
:mz (define h (make-hash)) (hash-set! h "list" l)
:echo mzeval("l")
:echo mzeval("h")

Note that in a :def function local variables are not visible to {expr}.

Can also be used as a method:

GetExpr()->mzeval()

only available when compiled with the +mzscheme feature