types.nim:
 var n22*: Engine22Manager

 proc en*(): var Engine22Manager {.inline.} = n22  # accessor for engine singleton - artifact from an earlier time when I
                                                   # barely knew Nim/was trying to get hot patching dlls working, (pre arc)
--------------------------
fontManager.nim: [Version throwing unhandled exception: index 1 not in 0 .. 0 [IndexDefect]]
 proc getFont*(fontName: string, size: int, fontMgr: FontManager): E22Font {.inline} =
  let indexName = fontName & "_" & $size
  if en().fm.fontIndices.hasKey(indexName):
    return en().fm.fonts[en().fm.fontIndices[indexName]]
  else: ...

--------------------------
fontManager.nim: [Version now working]
 proc getFont*(fontName: string, size: int): E22Font {.inline} =
  let indexName = fontName & "_" & $size
  if n22.fm.fontIndices.hasKey(indexName):
    return n22.fm.fonts[n22.fm.fontIndices[indexName]]
  else: ...