Difference between T and {T} in where clause

Can someone please explain the difference between where T and where {T}? I’ve been reading the documentation, but I’m kinda hazy on the specifics of this bit.

For a single type parameter, there is none - it’s just a matter of convenience of not writing them for a single parameter. Curly braces are only required for multiple type parameters, otherwise there’s a parsing ambiguity.

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Alrighty. Thanks for clarifying it.