Indicates how and whether the property becomes an observed attribute.
If the value is false, the property is not added to observedAttributes.
If true or absent, the lowercased property name is observed (e.g. fooBar
becomes foobar). If a string, the string value is observed (e.g
attribute: 'foo-bar').
Indicates if the property should reflect to an attribute.
If true, when the property is set, the attribute is set using the
attribute name determined according to the rules for the attribute
property option and the value of the property serialized using the rules
from the type property option.
Indicates how to serialize and deserialize the attribute to/from a
property. If this value is a function, it is used to deserialize the
attribute value a the property value. If it's an object, it can have keys
for fromAttribute and toAttribute where fromAttribute is the
deserialize function and toAttribute is a serialize function used to set
the property to an attribute. If no toAttribute function is provided and
reflect is set to true, the property value is set directly to the
attribute.
A function that indicates if a property should be considered changed when
it is set. The function should take the newValue and oldValue and
return true if an update should be requested.
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Defines options for a property accessor.