Allow environment = emptyenv() to reduce the size of serialized ggmaps
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feature request
- Dominant language
- R
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Description
I've noticed serializing simple plots e.g.
```R
> object.size(serialize(ggmap(get_map('Europe', zoom=4)),NULL))
148010056 bytes
```
Leads to very large R objects > 140MB
This can make it quite annoying when transferring these objects over a network.
What causes such crazy sizes?
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