Bug: @type array causes TypeError in JSON-LD parsing #1

Description

When JSON-LD uses an array for @type (which is valid per the JSON-LD spec), solid-shim throws a TypeError because it assumes @type is always a string.

Error

TypeError: i.@type.replace is not a function

Reproduction

Use any JSON-LD with an array type:

{
  "@context": ["https://www.w3.org/2018/credentials/v1"],
  "@type": ["VerifiableCredential", "UniversityDegreeCredential"],
  ...
}

Root Cause

In src/index.ts line 45:

if (node['@type']) {
  const typeUri = node['@type'].replace('schema:', 'http://schema.org/')
  targetStore.add(subject, $rdf.sym(RDF_TYPE), $rdf.sym(typeUri))
}

This assumes @type is a string, but JSON-LD allows arrays.

Suggested Fix

if (node['@type']) {
  const types = Array.isArray(node['@type']) ? node['@type'] : [node['@type']]
  types.forEach(t => {
    const typeUri = t.replace('schema:', 'http://schema.org/')
    targetStore.add(subject, $rdf.sym(RDF_TYPE), $rdf.sym(typeUri))
  })
}

This handles both string and array @type values correctly.

Context

Discovered while building a W3C Verifiable Credentials demo for jsonos. VCs commonly use type arrays like ["VerifiableCredential", "UniversityDegreeCredential"].