🥅 Throw a more useful message when subtypes are not invertible #45
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The `invert()` method assumes that all subtypes are invertible. However, the OT type `invert()` method is [optional][1], so not all types will have it implemented (`rich-text` is a notable example). This change checks for presence of the `invert()` function, and throws a more descriptive error if it's not present. [1]: https://github.com/ottypes/docs#optional-properties
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The
invert()method assumes that all subtypes are invertible. However,the OT type
invert()method is optional, so not all types willhave it implemented (
rich-textis a notable example).This change checks for presence of the
invert()function, and throwsa more descriptive error if it's not present.