♻️ Forward all search/uid_search arguments

Forward all `#search` and `#uid_search` arguments to `#search_internal`.
This simplifies future changes to search parameters.

lib/net/imap.rb

@@ -1929,6 +1929,9 @@ def uid_expunge(uid_set)
       end
     end
 
+    # :call-seq:
+    #   search(criteria, charset = nil) -> result
+    #
     # Sends a {SEARCH command [IMAP4rev1 §6.4.4]}[https://www.rfc-editor.org/rfc/rfc3501#section-6.4.4]
     # to search the mailbox for messages that match the given searching
     # criteria, and returns message sequence numbers.  +keys+ can either be a
@@ -1996,10 +1999,13 @@ def uid_expunge(uid_set)
     #   result = imap.search(["SUBJECT", "hi there", "not", "new")
     #   #=> Net::IMAP::SearchResult[1, 6, 7, 8, modseq: 5594]
     #   result.modseq # => 5594
-    def search(keys, charset = nil)
-      return search_internal("SEARCH", keys, charset)
+    def search(...)
+      search_internal("SEARCH", ...)
     end
 
+    # :call-seq:
+    #   uid_search(criteria, charset = nil) -> result
+    #
     # Sends a {UID SEARCH command [IMAP4rev1 §6.4.8]}[https://www.rfc-editor.org/rfc/rfc3501#section-6.4.8]
     # to search the mailbox for messages that match the given searching
     # criteria, and returns unique identifiers (<tt>UID</tt>s).
@@ -2008,7 +2014,7 @@ def search(keys, charset = nil)
     # backward compatibility) but adds SearchResult#modseq when the +CONDSTORE+
     # capability has been enabled.
     #
-    # See #search for documentation of search criteria.
+    # See #search for documentation of parameters.
     def uid_search(keys, charset = nil)
       return search_internal("UID SEARCH", keys, charset)
     end
@@ -2939,7 +2945,7 @@ def enforce_logindisabled?
       end
     end
 
-    def search_internal(cmd, keys, charset)
+    def search_internal(cmd, keys, charset = nil)
       keys = normalize_searching_criteria(keys)
       args = charset ? ["CHARSET", charset, *keys] : keys
       synchronize do