diff --git a/.internal/mergeData.js b/.internal/mergeData.js
deleted file mode 100644
index 506d1662b..000000000
--- a/.internal/mergeData.js
+++ /dev/null
@@ -1,89 +0,0 @@
-import composeArgs from './composeArgs.js'
-import composeArgsRight from './composeArgsRight.js'
-import replaceHolders from './replaceHolders.js'
-
-/** Used as the internal argument placeholder. */
-const PLACEHOLDER = '__lodash_placeholder__'
-
-/** Used to compose bitmasks for function metadata. */
-const WRAP_BIND_FLAG = 1
-const WRAP_BIND_KEY_FLAG = 2
-const WRAP_CURRY_BOUND_FLAG = 4
-const WRAP_CURRY_FLAG = 8
-const WRAP_ARY_FLAG = 128
-const WRAP_REARG_FLAG = 256
-
-/**
- * Merges the function metadata of `source` into `data`.
- *
- * Merging metadata reduces the number of wrappers used to invoke a function.
- * This is possible because methods like `bind`, `curry`, and `partial`
- * may be applied regardless of execution order. Methods like `ary` and
- * `rearg` modify function arguments, making the order in which they are
- * executed important, preventing the merging of metadata. However, we make
- * an exception for a safe combined case where curried functions have `ary`
- * and or `rearg` applied.
- *
- * @private
- * @param {Array} data The destination metadata.
- * @param {Array} source The source metadata.
- * @returns {Array} Returns `data`.
- */
-function mergeData(data, source) {
-  const bitmask = data[1]
-  const srcBitmask = source[1]
-
-  let newBitmask = bitmask | srcBitmask
-  const isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG)
-
-  const isCombo =
-    ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
-    ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
-    ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG))
-
-  // Exit early if metadata can't be merged.
-  if (!(isCommon || isCombo)) {
-    return data
-  }
-  // Use source `thisArg` if available.
-  if (srcBitmask & WRAP_BIND_FLAG) {
-    data[2] = source[2]
-    // Set when currying a bound function.
-    newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG
-  }
-  // Compose partial arguments.
-  let partials
-  let value = source[3]
-  if (value) {
-    partials = data[3]
-    data[3] = partials ? composeArgs(partials, value, source[4]) : value
-    data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4]
-  }
-  // Compose partial right arguments.
-  value = source[5]
-  if (value) {
-    partials = data[5]
-    data[5] = partials ? composeArgsRight(partials, value, source[6]) : value
-    data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6]
-  }
-  // Use source `argPos` if available.
-  value = source[7]
-  if (value) {
-    data[7] = value
-  }
-  // Use source `ary` if it's smaller.
-  if (srcBitmask & WRAP_ARY_FLAG) {
-    data[8] = data[8] == null ? source[8] : Math.min(data[8], source[8])
-  }
-  // Use source `arity` if one is not provided.
-  if (data[9] == null) {
-    data[9] = source[9]
-  }
-  // Use source `func` and merge bitmasks.
-  data[0] = source[0]
-  data[1] = newBitmask
-
-  return data
-}
-
-export default mergeData