String.Join with pipe

1: 

module String = let Join separator (xs:System.Collections.Generic.IEnumerable<string>) = System.String.Join(separator, xs)

module String

from Microsoft.FSharp.Core

val Join : separator:string -> xs:System.Collections.Generic.IEnumerable<string> -> string

val separator : string

val xs : System.Collections.Generic.IEnumerable<string>

namespace System

namespace System.Collections

namespace System.Collections.Generic

type IEnumerable<'T> =
  inherit IEnumerable
  member GetEnumerator : unit -> IEnumerator<'T>

Multiple items
val string : value:'T -> string

--------------------
type string = System.String

Multiple items
type String =
  interface IComparable
  interface IEnumerable
  interface IConvertible
  interface IEnumerable<char>
  interface IComparable<string>
  interface IEquatable<string>
  interface ICloneable
  new : value: char [] -> unit + 8 overloads
  member Clone : unit -> obj
  member CompareTo : value: obj -> int + 1 overload
  ...

--------------------
System.String(value: char []) : System.String
System.String(value: nativeptr<char>) : System.String
System.String(value: nativeptr<sbyte>) : System.String
System.String(value: System.ReadOnlySpan<char>) : System.String
System.String(c: char, count: int) : System.String
System.String(value: char [], startIndex: int, length: int) : System.String
System.String(value: nativeptr<char>, startIndex: int, length: int) : System.String
System.String(value: nativeptr<sbyte>, startIndex: int, length: int) : System.String
System.String(value: nativeptr<sbyte>, startIndex: int, length: int, enc: System.Text.Encoding) : System.String

System.String.Join(separator: string, values: System.Collections.Generic.IEnumerable<string>) : string
System.String.Join<'T>(separator: string, values: System.Collections.Generic.IEnumerable<'T>) : string
System.String.Join(separator: string, [<System.ParamArray>] values: obj []) : string
System.String.Join(separator: string, [<System.ParamArray>] value: string []) : string
System.String.Join<'T>(separator: char, values: System.Collections.Generic.IEnumerable<'T>) : string
System.String.Join(separator: char, [<System.ParamArray>] values: obj []) : string
System.String.Join(separator: char, [<System.ParamArray>] value: string []) : string
System.String.Join(separator: string, value: string [], startIndex: int, count: int) : string
System.String.Join(separator: char, value: string [], startIndex: int, count: int) : string