decode a TIO.run link in Dyalog APL / .Net

tioCode.dyalog

 tioCode←{
     ⍝ decodes a TIO.run link such as
     ⍝ tioCode 'https://tio.run/##SyzI0U2pTMzJT////1Hf1EdtExSMFYwf9W551LvZkgsioq4OZSg86lzwqHcFkor//wE'

     ⍝ load dfns workspace to use base64 decoder
     _←{(⍎⍵ ⎕NS ⍬).⎕CY ⍵}'dfns'

     ⎕USING←'System' 'System.Net,System.dll'

     hash←('^https://tio\.run/##'⎕R'')⍵    ⍝ remove web address parts of the link

     hash←('/'@{⍵='_'})('+'@{⍵∊'@-'})WebUtility.UrlDecode⊂hash
     zBytes←dfns.base64 hash

     inflatedStream←⎕NEW IO.MemoryStream
     deflateStream←⎕NEW IO.Compression.DeflateStream((⎕NEW IO.MemoryStream(⊂zBytes)) IO.Compression.CompressionMode.Decompress)

     _←{deflateStream.CopyTo inflatedStream} dfns.do ⍬

     bytes←inflatedStream.ToArray

     ↑{'UTF-8'⎕UCS⍵}¨255(≠⊆⊢)bytes
 }