+val hv_of_assoc : (string * sv) list -> hv
+(** Create an [HV] directly from an assoc list. Perl hashes cannot
+ * support multiple values attached to the same key, so if you try
+ * to provide an assoc list with multiple identical keys, the results
+ * will be undefined.
+ *)
+val assoc_of_hv : hv -> (string * sv) list
+(** Take an [HV] and return an assoc list. *)
+val hv_keys : hv -> string list
+(** Return all the keys of an [HV]. *)
+val hv_values : hv -> sv list
+(** Return all the values of an [HV]. *)
+
+(* The following are the low-level iteration interface to hashes,
+ * which you probably shouldn't use directly. Use {!hv_keys},
+ * {!assoc_of_hv}, etc. instead. See [perlguts(3)] if you really
+ * want to use this interface.
+ *)
+type he
+val hv_iterinit : hv -> Int32.t
+val hv_iternext : hv -> he
+val hv_iterkey : he -> string
+val hv_iterval : hv -> he -> sv
+val hv_iternextsv : hv -> string * sv