[ruby-core:95951] [Ruby master Bug#16371] Inconsistent usage of Double splat operator

Issue #16371 has been reported by dmytro.vasin (Dmytro Vasin).

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Bug #16371: Inconsistent usage of Double splat operator
https://bugs.ruby-lang.org/issues/16371

* Author: dmytro.vasin (Dmytro Vasin)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.6.0
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
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Here is an issue with wierd behavior of a ruby double splat operator: 

```
a = {a: 'a'}
b = {'b' => 'b'}

{x: 'x', **a}
#=> {:x=>"x", :a=>"a"}

{x: 'x', **b}
#=> TypeError (hash key "b" is not a Symbol)
```

But when I do that implicitly it works:
```
{x: 'x', **{'b' => 'b'}} 
#=> {:x=>"x", "b"=>"b"}
```

In the same time: 
```
{**{'b' => 'b'}}
# TypeError (hash key "b" is not a Symbol)
```

From my point of view, it definitely works inconsistently

Could you help with that example or give advice? ( maybe I incorrectly use it? ) 



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