[ruby-core:112940] [Ruby master Bug#19539] Heredocs with leading spaces inconsistency

Issue #19539 has been reported by hurricup (Alexandr Evstigneev).

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Bug #19539: Heredocs with leading spaces inconsistency
https://bugs.ruby-lang.org/issues/19539

* Author: hurricup (Alexandr Evstigneev)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
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This is more like technical inconsistency that bothers me. Not sure someone will use this in real life, but still.
This works fine:

```
puts <<'    ABC'
marker with spaces
    ABC
```

But this is not:

```
puts <<-'    ABC'
marker with spaces
    ABC
```

as well as 

```
puts <<~'    ABC'
marker with spaces
    ABC
```

I would expect it to wok properly, even in case:

```
puts <<-'    ABC'
    marker with spaces
        ABC
```




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