[SkyMarshal] Fix printing char-like things

The LCM boolean, int8_t, uint8_t, and byte are aliases of signed or
unsigned char in C++, so they get printed as ascii 0/1/etc, which is
silly, especially since ascii 0 and 1 aren't even printable characters.
Print bools as bools, and the others as ints.  LCM doesn't have a char
type, so if you wanted that you're out of luck.

Topic: skymarshal-print-bools
Reviewers: nikhil,peter,danny
GitOrigin-RevId: a640504b22f5af0fd523f51f32799e9d1bc44198

third_party/skymarshal/skymarshal/templates/lcmtype.hpp.template

@@ -145,7 +145,13 @@ class {{lcmtype.name}}
         {% if member.dims | length == 1 %}
             stream << "{{member.name}}=[";
             for (size_t i = 0; i < obj.{{member.name}}.size(); ++i) {
+            {% if member.type_ref.name == "boolean" %}
+                stream << (obj.{{member.name}}[i] ? "true" : "false");
+            {% elif member.type_ref.name in ("int8_t", "uint8_t", "byte") %}
+                stream << static_cast<int16_t>(obj.{{member.name}}[i]);
+            {% else %}
                 stream << obj.{{member.name}}[i];
+            {% endif %}
                 if (i + 1 < obj.{{member.name}}.size()) {
                     stream << ", ";
                 }
@@ -155,6 +161,10 @@ class {{lcmtype.name}}
             {# Multidimensional arrays will require some complicated stuff #}
             stream << "{{member.name}}=<MULTIDIMENSIONAL ARRAY {{ array_type_str(member) }}>"{{ comma(loop.last) }};
         {% endif %}
+    {% elif member.type_ref.name == "boolean" %}
+            stream << "{{member.name}}=" << (obj.{{member.name}} ? "true" : "false"){{ comma(loop.last) }};
+    {% elif member.type_ref.name in ("int8_t", "uint8_t", "byte") %}
+            stream << "{{member.name}}=" << static_cast<int16_t>(obj.{{member.name}}){{ comma(loop.last) }};
     {% else %}
             stream << "{{member.name}}=" << obj.{{member.name}}{{ comma(loop.last) }};
     {% endif %}