Value.To
val string_value : value -> value
val string : value -> string option
return None if value return a null string
None
val bool : value -> bool or_js_exn
val int32 : value -> int32 or_js_exn
val uint32 : value -> Unsigned.uint32 or_js_exn
val int64 : value -> int64 or_js_exn
val float : value -> float or_js_exn