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diff --git a/Cargo.toml b/Cargo.toml
index 5b99c37..35d4339 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,34 +1,64 @@
 [package]
 name = "reverse"
-version = "0.4.0"
+version = "0.5.0"
 authors = ["Avril <flanchan@cumallover.me>"]
 edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
-default = ["output-lines", "buffer-output", "ignore-output-errors", "ignore-invalid-args"]
+default = []
+
+unstable = ["parking_lot?/nightly", "memchr/compiler_builtins", "crossbeam-queue?/nightly", "futures?/unstable", "color-eyre/track-caller"]
+
+# Enables parallelising the operation where possible.
+#
+# Cli config options can control this, but in default auto setting the process will decide if parallelisation is worth using on the dimensions of the provided input and system.
+threads = ["dep:rayon", "dep:parking_lot", "dep:crossbeam-queue", "dep:num_cpus", "threads-async"]
+
+# Attempt `mmap()`ping the input instead of reading it.
+# If the output can be mapped, it may also be.
+# 
+# Useable on unix-family systems. (TODO: Make this dependency target-dependent for unix instead of a manual feature addition like this.)
+mapped-file = ["dep:mapped-file"]
+
+# We are using `tokio_uring` & `tokio-stream` to allow parallel queued writes. (TODO: If we end up using (or needing) this feature for partitioning (e.g. we need a controlled IO thread that takes the data gathered by the parallelised partition system or we need a task pool (NOTE: the task pool will execute on tokio_uring's thread only; rayon's thread pool is being used for auto parallelisation currently) to spawn reverse-reader tasks per partition.) then: Remove the use of crossbeam (XXX: and maybe rayon?), and use Tokio runtime for manual parallelised partitioning/line-reversing.)
+#
+# NOTE: **internal feature**
+threads-async = ["threads", "dep:futures", "dep:tokio-uring", "dep:tokio-stream"]
+
+#rayon = ["dep:rayon"]
+#parking_lot = ["dep:parking_lot"]
+
+#XXX ["output-lines", "buffer-output", "ignore-output-errors", "ignore-invalid-args"]
+
+#TODO: Branch repo, and begin refactor:
+#
+#TODO: Move these features to Clap runtime arg parse options; Major refactor, bump to 0.5.0 or to 1.0.0[r0]
+
+#TODO: Add feature 'mapped-file': Attempt to map input file and process data backwards from end if possible.
+#TODO: Add feature 'threads': Use rayon to parallelise line-searching in buffer (or mapped file ^) (partition in half, move partition line to closest {r,}memchr('\n'); repeat N times recursively on each side (parallel) where N is number of logical CPU cores and/or to get the chunks below/in a certain size range. 
 
 # Output as lines instead of `["2", "1", "0"]`
-output-lines = []
+#XXX output-lines = []
 
 # Print each string escaped
-output-quoted = []
+#XXX output-quoted = []
 
 # Buffer output to conserve syscalls, useful for very large inputs (can cause higher memory usage, but generally speeds output up considerably)
-buffer-output = []
+#XXX buffer-output = []
 
 # Do not attempt to handle output errors.
 # Disable this if you are writing to a faulty device or expect some output operations to stdout to fail.
-ignore-output-errors = []
+#XXX ignore-output-errors = []
 
 # Ignore invalid arguments instead of removing invalid UTF8 characters if they exist in the argument
-ignore-invalid-args = []
+#XXX ignore-invalid-args = []
 
 # Operate on raw input byte arrays instead of strings; so non-utf8 characters will be preserved in both input and output
 # NOTE: May cause collecting from stdin to be *slightly* slower when enabled; so only enable if you intend to be operating on non-utf8 strings (which is usually unlikely)
 # NOTE: `ignore-invalid-args` will do nothing if this is enabled.
-byte-strings = []
+#XXX byte-strings = []
 
 [profile.release]
 opt-level = 3
@@ -41,3 +71,15 @@ inherits="release"
 strip=false
 
 [dependencies]
+bytes = "1.6.0"
+clap = { version = "4.5.4", features = ["derive", "string", "unicode", "wrap_help"] }
+color-eyre = { version = "0.6.3", default-features = false }
+crossbeam-queue = { version = "0.3.11", optional = true }
+futures = { version = "0.3.30", optional = true, default-features = false, features = ["alloc", "std", "async-await"] }
+mapped-file = { version = "0.0.8", features = ["file"], optional = true }
+memchr = "2.7.2"
+num_cpus = { version = "1.16.0", optional = true }
+parking_lot = { version = "0.12.1", optional = true, features = ["arc_lock", "owning_ref", "send_guard"] }
+rayon = { version = "1.10.0", optional = true }
+tokio-stream = { version = "0.1.15", optional = true, features = ["sync", "fs", "tokio-util", "io-util", "signal"] }
+tokio-uring = { version = "0.4.0", optional = true, features = ["bytes"] }