Similar to native Errors(), GLib.Error is extended to provide debug
information in the form of fileName, lineNumber and stack (obtained
using the JS debug API). At the same time, the existing stack logging
facility is modified to be similar in format to the native one, and
logError is modified to avoid iterating object properties (which
gives an undefined order, and does not include prototype properties)

https://bugzilla.gnome.org/show_bug.cgi?id=591480