note charsets are TODO

src/terminal/sgr.zig

@@ -10,7 +10,13 @@ pub const Attribute = union(enum) {
     unset: void,
 
     /// Unknown attribute, the raw CSI command parameters are here.
-    unknown: []const u16,
+    unknown: struct {
+        /// Full is the full SGR input.
+        full: []const u16,
+
+        /// Partial is the remaining, where we got hung up.
+        partial: []const u16,
+    },
 
     /// Bold the text.
     bold: void,
@@ -149,7 +155,7 @@ pub const Parser = struct {
             else => {},
         }
 
-        return Attribute{ .unknown = slice };
+        return Attribute{ .unknown = .{ .full = self.params, .partial = slice } };
     }
 };
 

src/terminal/stream.zig

@@ -413,6 +413,13 @@ pub fn Stream(comptime Handler: type) type {
             action: Parser.Action.ESC,
         ) !void {
             switch (action.final) {
+                // Charsets
+                'B' => {
+                    // TODO: Charset support. Just ignore this for now because
+                    // every application sets this and it makes our logs SO
+                    // noisy.
+                },
+
                 // DECSC - Save Cursor
                 '7' => if (@hasDecl(T, "saveCursor")) switch (action.intermediates.len) {
                     0 => try self.handler.saveCursor(),