we can force mandatory to False

tests/dictionaries/01boolean_no_mandatory/00-base.xml

@@ -0,0 +1,8 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<rougail version="0.9">
+    <variables>
+        <variable name="my_variable" type="boolean" mandatory="False"/>
+    </variables>
+</rougail>
+<!-- vim: ts=4 sw=4 expandtab
+-->

tests/dictionaries/01boolean_no_mandatory/makedict/base.json

@@ -0,0 +1,3 @@
+{
+    "rougail.my_variable": true
+}

tests/dictionaries/01boolean_no_mandatory/tiramisu/base.py

@@ -0,0 +1,16 @@
+from importlib.machinery import SourceFileLoader
+from importlib.util import spec_from_loader, module_from_spec
+loader = SourceFileLoader('func', 'tests/dictionaries/../eosfunc/test.py')
+spec = spec_from_loader(loader.name, loader)
+func = module_from_spec(spec)
+loader.exec_module(func)
+for key, value in dict(locals()).items():
+    if key != ['SourceFileLoader', 'func']:
+        setattr(func, key, value)
+try:
+    from tiramisu3 import *
+except:
+    from tiramisu import *
+option_2 = BoolOption(name="my_variable", doc="my_variable", default=True, properties=frozenset({"normal"}))
+option_1 = OptionDescription(name="rougail", doc="rougail", children=[option_2])
+option_0 = OptionDescription(name="baseoption", doc="baseoption", children=[option_1])