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call-seq:
pos = n -> n
pointer = n -> n
Sets the [byte position][2] and the [character position][11];
returns `n`.
Does not affect [match values][9].
For non-negative `n`, sets the position to `n`:
```rb
scanner = StringScanner.new(HIRAGANA_TEXT)
scanner.string # => "こんにちは"
scanner.pos = 3 # => 3
scanner.rest # => "んにちは"
scanner.charpos # => 1
```
For negative `n`, counts from the end of the [stored string][1]:
```rb
scanner.pos = -9 # => -9
scanner.pos # => 6
scanner.rest # => "にちは"
scanner.charpos # => 2
```
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