FWIW, this is how I'd deal with the motivating issue around RecordConfig{}
and mostly-nil Metadata maps:
https://go.dev/play/p/PAMyQ8KG6v9
By making metadata a private member of the struct, you can only access it
from outside the package via method Metadata() [which will allocate it if
required] and MetadataReadonly() [which is allowed to return nil]
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