Looking at Tcl_GetInt, I need this type of function for an unsigned __int64 which is unfortunately not present in tclDecls.h
tclDecls.h can be found in
Tcl8.6.5\include
Is it safe to use Tcl_GetDouble and convert it later to unsigned __int64?
Use Tcl_GetWideIntFromObj to obtain a Tcl_WideInt, or better a Tcl_WideUInt. Then cast to unsigned __int64, if need be.
Is it safe to use Tcl_GetDouble and convert it later to unsigned __int64?
It depends: Safe conversion from double to unsigned 64 bit integer
