diff --git a/lib/interscript/isc/node_adapter.rb b/lib/interscript/isc/node_adapter.rb
index 4229bcbb..c2cca5eb 100644
--- a/lib/interscript/isc/node_adapter.rb
+++ b/lib/interscript/isc/node_adapter.rb
@@ -29,7 +29,7 @@ def build
           doc.aliases = build_aliases
           build_stages.each { |name, stage| doc.stages[name] = stage }
           build_dependencies(doc)
-          doc.name = @isc_doc[:system_code]
+          doc.name = @isc_doc[:systemCode]
         end
       end
 
@@ -202,7 +202,21 @@ def convert_concat(concat)
 
       def convert_set(set)
         Interscript::Node::Item::Any.new(
-          set.chars.map { |c| Interscript::Node::Item::String.new(c) }
+          set.chars.map do |c|
+            # Entries may be primitives/alias refs (e.g. any([boundary,
+            # "\u200c", "\u200d"])) — stringifying them baked an object
+            # inspect into the compiled character class.
+            case c
+            when ::String
+              Interscript::Node::Item::String.new(c)
+            when Items::Primitive
+              convert_primitive(c)
+            when Items::AliasRef
+              convert_alias_ref(c)
+            else
+              convert_item(c)
+            end
+          end
         )
       end
     end
diff --git a/spec/interscript/isc/node_adapter_spec.rb b/spec/interscript/isc/node_adapter_spec.rb
index aae5423b..301e8a83 100644
--- a/spec/interscript/isc/node_adapter_spec.rb
+++ b/spec/interscript/isc/node_adapter_spec.rb
@@ -249,3 +249,17 @@ def parse_and_adapt(src)
     end
   end
 end
+
+RSpec.describe "NodeAdapter document identity" do
+  it "carries the system code into the document name" do
+    tree = Interscript::Isc::Parser.parse(
+      'system "X:a-b:C-D:1" { stage main { sub { from "a" to "b" } } }'
+    )
+    doc = Interscript::Isc::DocumentBuilder.build(tree)
+    node = Interscript::Isc::NodeAdapter.to_interscript_node(doc)
+    # The Ruby compiler registers compiled maps under Document#name; a
+    # nil name registered them under "" and every transliterate call
+    # crashed on nil.call.
+    expect(node.name).to eq("X:a-b:C-D:1")
+  end
+end
diff --git a/spec/interscript_spec.rb b/spec/interscript_spec.rb
index 62564564..1f022067 100644
--- a/spec/interscript_spec.rb
+++ b/spec/interscript_spec.rb
@@ -2,8 +2,16 @@
 
 cache = {}
 mask = ENV["TRANSLIT_SYSTEM"] || "*"
-# The legacy .imp sweep only (see legacy_maps in spec_helper).
-maps = legacy_maps(select: mask)
+# The ISC corpus sweep runs behind ISC_SWEEP=1: each example is
+# timeout-guarded (at least one map hangs the interpreter) and
+# per-map failures are expected until the ISC-era conformance work
+# completes — the sweep exists to MEASURE that gap, gated so CI stays
+# green while it closes.
+maps = if ENV["ISC_SWEEP"]
+  Interscript.maps(basename: false, select: mask)
+else
+  legacy_maps(select: mask)
+end
 
 # Precache can be used to compare interpreter to compiler performance
 if ENV.include? "PRECACHE"