Fix kind check for array variables

Author: YingboMa

src/parameters.jl

@@ -4,8 +4,10 @@ struct MTKParameterCtx end
 function isparameter(x)
     x = unwrap(x)
 
+    if x isa Symbolic && (isp = getmetadata(x, MTKParameterCtx, nothing)) !== nothing
+        return isp
     #TODO: Delete this branch
-    if x isa Symbolic && Symbolics.getparent(x, false) !== false
+    elseif x isa Symbolic && Symbolics.getparent(x, false) !== false
         p = Symbolics.getparent(x)
         isparameter(p) ||
             (hasmetadata(p, Symbolics.VariableSource) &&

src/variables.jl

@@ -20,8 +20,9 @@ struct Stream <: AbstractConnectType end   # special stream connector
 
 isvarkind(m, x::Num) = isvarkind(m, value(x))
 function isvarkind(m, x)
-    p = getparent(x, nothing)
-    p === nothing || (x = p)
+    iskind = getmetadata(x, m, nothing)
+    iskind !== nothing && return iskind
+    x = getparent(x, x)
     getmetadata(x, m, false)
 end