[ruby-core:94326] [Ruby master Bug#16099] UTF-16LE BOM followed by '\0' is missed

Issue #16099 has been reported by nobu (Nobuyoshi Nakada).

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Bug #16099: UTF-16LE BOM followed by '\0' is missed
https://bugs.ruby-lang.org/issues/16099

* Author: nobu (Nobuyoshi Nakada)
* Status: Assigned
* Priority: Normal
* Assignee: nobu (Nobuyoshi Nakada)
* Target version: 
* ruby -v: 
* Backport: 2.5: REQUIRED, 2.6: REQUIRED
----------------------------------------
```
$ ruby -e 'File.binwrite("u.txt", "\xff\xfe\x00\x01")'
$ file u.txt 
u.txt: Little-endian UTF-16 Unicode text, with no line terminators
$ ruby -e 'p File.open("u.txt", "rb:bom|utf-8", &:external_encoding)'
#<Encoding:UTF-8>
```

The last result must be UTF-16LE.



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