Left and right division for strings

Internals & Design
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10

Note also that this is buggy:

julia> s = "α.jl"
"α.jl"

julia> s[begin:end-3]
ERROR: StringIndexError: invalid index [2], valid nearby indices [1]=>'α', [3]=>'.'

(It’s really tempting to write this, which is a key motivation for a StringIndex type.)

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