Conversion error when using a double parameter as ParameterAssignment value

[arauschert]

Describe the bug
In the OSC XML standard the class ParameterAssignment has an attribute 'value' of type 'string' so that it can hold any data type (see here).
This works, if the value is hardcoded. But when trying to set the value through a parameter of type 'double', the OSC API will return an error upon parsing:

Value '231.100000' cannot be converted to type 'string' (30,71)

Interestingly when setting the parameter value to an integer number (e.g. 231.0 but still with parameterType double) in the ParameterDeclaration, the OSC API will not return an error upon parsing.

To Reproduce
Here is the scenario and catalog I used for reproducing the error:
type_conversion.zip

Expected behavior
No error by OSC API when parsing double parameters into attributes of type string.

Further info
Probably the problem originates from here:

openscenario.api.test/cpp/expressionsLib/src/ExprValue.cpp

Line 433 in 62058bf

if (doubleValue == std::ceil(doubleValue))

The double value must be basically an integer, otherwise the "if" clause will not evaluate to true.

In v1_0 when there was still the parameter resolver instead of the expression resolver, everything could be converted to a string, while now there is a constraint:

openscenario.api.test/cpp/openScenarioLib/src/v1_0/parameter/ParameterResolverV1_0.cpp

Line 43 in 62058bf

// Everything can be converted into String