Cannot set RAM parameter with SetParameters() function

In Python, I want to set the RAM parameter (available memory for processing), using SetParameters() but it fails.

Small piece of code for reproducing the error :

import otbApplication
app = otbApplication.Registry.CreateApplication('BandMath')
app.SetParameters({'il': ['any_image.tif'], 'exp': 'im1b1', 'out': 'output.tif', 'ram': 512})

Error raised :

NotImplementedError: Wrong number or type of arguments for overloaded function 'Application_SetParameterString'.

Possible C/C++ prototypes are:

Application::SetParameterString(std::string,std::string,bool)

Application::SetParameterString(std::string,std::string)

It seems to fail in the SetParameterValue() function. Indeed, when looking at the code of SetParameterValue inside otbApplication.py, ParameterType_RAM is handled as a string whereas it should be handled as an int.

Configuration information

OTB version 7.2