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https://issues.apache.org/jira/browse/GROOVY-9848?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King resolved GROOVY-9848.
-------------------------------
Fix Version/s: 6.0.0-alpha-2
Resolution: Fixed
Partial rollback to 5.0.7 to allow forward opt-in to aid porting.
> Change map membership (in) from value-truthy to key-based
> ---------------------------------------------------------
>
> Key: GROOVY-9848
> URL: https://issues.apache.org/jira/browse/GROOVY-9848
> Project: Groovy
> Issue Type: Improvement
> Reporter: Keegan Witt
> Assignee: Eric Milles
> Priority: Major
> Labels: breaking, breaking_change
> Fix For: 6.0.0-alpha-2
>
>
> {code:groovy}def map = [a:1,b:2,z:0].withDefault{3}{code}
> Options:
> # do nothing
> {code:groovy}
> assert 'a' in map
> assert 'b' in map
> assert 'x' in map // mutates!
> assert 'z' !in map
> assert 4 === map.size()
> {code}
> # change mutation of {{isCase}} -- guard with {{containsKey}}:
> {code:groovy}
> assert 'a' in map
> assert 'b' in map
> assert 'x' !in map
> assert 'z' !in map
> assert 3 === map.size()
> {code}
> # change {{isCase}} to {{containsKey}}:
> {code:groovy}
> assert 'a' in map
> assert 'b' in map
> assert 'x' !in map
> assert 'z' in map
> assert 3 === map.size()
> // grep and switch behavior change (see below)
> {code}
> # ask user to test key set
> {code:groovy}
> assert 'a' in map.keySet()
> assert 'b' in map.keySet()
> assert 'x' !in map.keySet()
> assert 'z' !in map.keySet()
> assert 3 === map.size()
> {code}
> # provide {{@OperatorRename}} support:
> {code:groovy}
> @OperatorRename(isCase='containsKey')
> void test() {
> assert 'a' in map
> assert 'b' in map
> assert 'x' !in map
> assert 'z' !in map
> assert 3 === map.size()
> }
> {code}
> # remap operator {{in}} to {{isIn}} (or some such):
> {code:groovy}
> // DGMs:
> boolean isIn(Map map, Object key) {
> return map != null && map.containsKey(key);
> }
> boolean isIn(Object obj, Object value) {
> return InvokerHelper.invokeMethod(obj, "isCase", new Object[]{value});
> }
> assert 'a' in map
> assert 'b' in map
> assert 'x' !in map
> assert 'z' in map
> assert 3 === map.size()
> // behavior change for any type that provides "isIn"
> {code}
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