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Document that write_json will error on unserializable types. (#5539)
Previously it was erroneously documented that it would save them as null.
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@ -712,7 +712,7 @@ Call these functions only at load time!
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* `minetest.write_json(data[, styled])`: returns a string or `nil` and an error message
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* Convert a Lua table into a JSON string
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* styled: Outputs in a human-readable format if this is set, defaults to false
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* Unserializable things like functions and userdata are saved as null.
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* Unserializable things like functions and userdata will cause an error.
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* **Warning**: JSON is more strict than the Lua table format.
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1. You can only use strings and positive integers of at least one as keys.
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2. You can not mix string and integer keys.
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@ -2709,7 +2709,7 @@ These functions return the leftover itemstack.
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* `minetest.write_json(data[, styled])`: returns a string or `nil` and an error message
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* Convert a Lua table into a JSON string
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* styled: Outputs in a human-readable format if this is set, defaults to false
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* Unserializable things like functions and userdata are saved as null.
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* Unserializable things like functions and userdata will cause an error.
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* **Warning**: JSON is more strict than the Lua table format.
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1. You can only use strings and positive integers of at least one as keys.
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2. You can not mix string and integer keys.
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