what are the defaults for these values: ``` # us...
# general
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what are the defaults for these values:
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#   user: the current user
#   homedir: the current user's home directory
#   buildroot: the root of this repo
#   pants_bootstrapdir: the global pants scratch space primarily used for caches
#   pants_supportdir: pants support files for this repo go here# for example: ivysettings.xml
#   pants_distdir: user visible artifacts for this repo go here
#   pants_workdir: the scratch space used to for live builds in this repo