fandango write_attribute for boolean does not evaluate true or false

From command line write_attribute for boolean attributes does not handle T/true or F/false being passed.

fandango write_attribute id11/eps/plc-01/cc1_af_alrm true
fandango read_attribute id11/eps/plc-01/cc1_af_alrm
False

fandango write_attribute id11/eps/plc-01/cc1_af_alrm 1
fandango read_attribute id11/eps/plc-01/cc1_af_alrm
True