fix(pdk) request.get_uri_captures now returns unnamed as an array

the 'unnamed' entry was a regular Lua table, by adding the array_mt
it can be exported as an array even if empty

CHANGELOG.md

@@ -91,6 +91,16 @@
 - Fix an issue where validation to regex routes may be skipped when the old-fashioned config is used for DB-less Kong.
   [#10348](https://github.com/Kong/kong/pull/10348)
 
+#### PDK
+
+- `request.get_uri_captures` now returns the unnamed part tagged as an array (for jsonification).
+  [#10390](https://github.com/Kong/kong/pull/10390)
+
+#### Plugins
+
+- **Request-Termination**: If the echo option was used, it would not return the uri-captures.
+  [#10390](https://github.com/Kong/kong/pull/10390)
+
 ## 3.2.0
 
 ### Breaking Changes

kong/pdk/request.lua

@@ -850,17 +850,17 @@ local function new(self)
       local typ = type(k)
       if typ == "number" then
         unnamed_captures[k] = v
-  
+
       elseif typ == "string" then
         named_captures[k] = v
-  
+
       else
         kong.log.err("unknown capture key type: ", typ)
       end
     end
-  
+
     return {
-      unnamed = unnamed_captures,
+      unnamed = setmetatable(unnamed_captures, cjson.array_mt),
       named = named_captures,
     }
   end

t/01-pdk/04-request/21-get_uri_captures.t

@@ -17,7 +17,7 @@ __DATA__
     access_by_lua_block {
       local PDK = require "kong.pdk"
       local pdk = PDK.new()
-      
+
       local m = ngx.re.match(ngx.var.uri, [[^\/t((\/\d+)(?P<tag>\/\w+))?]], "jo")
 
       ngx.ctx.router_matches = {
@@ -28,6 +28,9 @@ __DATA__
       ngx.say("uri_captures: ", "tag: ", captures.named["tag"],
               ", 0: ", captures.unnamed[0], ", 1: ", captures.unnamed[1],
               ", 2: ", captures.unnamed[2], ", 3: ", captures.unnamed[3])
+
+      array_mt = assert(require("cjson").array_mt, "expected array_mt to be truthy")
+      assert(getmetatable(captures.unnamed) == array_mt, "expected the 'unnamed' captures to be an array")
     }
   }
 --- request