readFromStream() parser fails with negative exponents in scientific notation

Dear ROOT support,

In ROOT version 5.34.03, the readFromStream() ASCII parser in RooFit seems to no longer be able to handle scientific notation with negative exponents -- in fact, the negative sign is interpreted as a token separator and the value cannot be cast into a floating variable. I was using 5.32 ROOT versions to parse text-based files that set up a RooFit model, and noticed that a compilation against 5.34 would now fail. I include an example script below. Please advise as to whether this will be fixed in a newer release -- converting many PDF parameters to decimal notation is obviously a hack fix, but not desirable in the long term in many numerical contexts.

Best regards,
Jed Biesiada

Example:

RooRealVar v("v", "", 0);
ifstream is("test.dat"
RooArgSet(v).readFromStream(is,0);

If test.dat contains the line

v = 3E-9 L(0 - 5)

One gets:

0 ERROR:InputArguments -- RooRealVar::readFromStream(v): parse error, cannot convert '3E' to double precision