Is "Allowed Implicit conversions" up to date?

[Hajime]

Hi everyone,

I'm just wondering if the table in this page is up to date?
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types#LanguageManualTypes-AllowedImplicitConversions

It seems bigint and timestamp do implicit conversions:

0: jdbc:hive2://node1.ubuntu.localdomain:1051> select
cast(unix_timestamp('2018-12-12 00:00:00', 'yyyy-MM-dd HH:mm:ss') as
bigint) == cast('2018-12-12 00:00:00.0' as timestamp);
+-------+--+
|  _c0  |
+-------+--+
| true  |
+-------+--+

Or am i misunderstanding how to read this table?

Thank you!
Hajime