lib/util.run: echo_export (): run the export builtin using `builtin` to avoid recursively calling any export alias or function defined by the user (e.g. `alias export=echo_export`. this causes util.run to be idempotent, such that it can be included multiple times without causing problems due to the redefinition of functions, vars, etc.
lib/util.run: echo_export (): run the export builtin using `builtin` to avoid recursively calling any export alias or function defined by the user (e.g. `alias export=echo_export`. this causes util.run to be idempotent, such that it can be included multiple times without causing problems due to the redefinition of functions, vars, etc.